Police took a 20-year-old Saudi national into custody near the scene of yesterday’s horrific Boston Marathon bomb attack, law-enforcement sources told The Post.

The potential suspect was questioned by the FBI and local police yesterday at Boston’s Brigham and Women’s Hospital, where he was under heavy guard while being treated for shrapnel injuries to his leg sustained in the blast.

In late afternoon, a large group of federal and state law enforcement agents raided an apartment in a building in the Saudi man’s hometown of Revere, Mass.

FBI agents could be seen through one window. It was not clear what, if anything, they found. But Revere fire officials said they were called out to support bomb-squad officers as part of an investigation of a “person of interest” in the marathon attack.

At the hospital, investigators seized the man’s clothes to examine whether they held any evidence that he was behind the attack. The law-enforcement sources also told The Post that the man was not free to leave the medical center.

He had suffered shrapnel wounds to the back of a leg but was not likely to die, a source said.

As of last night, investigators had not yet directly asked the man whether he had set off the bombs. But they had asked him general questions, such as what he was doing in the area.

The potential suspect told police he had dinner Sunday night near Boston’s Prudential Center, about half a mile from the blast site, the sources said.

He also said that he went to the Copley Square area yesterday to witness the finish of the race.

The sources said that, after the man was grabbed by police, he smelled of gunpowder and declared, “I thought there would be a second bomb.”

He also asked: “Did anyone die?”

Officials showed up at the Revere apartment at about 5:30 p.m. in unmarked vehicles, a resident of the building said. It’s on a street where the man had lived, law-enforcement sources told The Post.

About an hour later, more vehicles, carrying agents of the FBI, Homeland Security and ATF also descended on the site, along with firefighters and a bomb squad. They searched an apartment on the fifth floor.

By midnight, most of the authorities had left the complex, which sits on a piece of ocean-front property in the seaside city.

The FBI has opened an investigation into possible civil rights violations after reports of hate speech at Oberlin College in Ohio, one of the first U.S. schools to integrate black and white students, a school spokesman said on Friday.

The investigation by the FBI's Cleveland office follows Oberlin's decision to suspend classes and activities for the day on Monday and hold campus-wide discussions after a report that a person wearing a Ku Klux Klan costume was seen near its Afrikan Heritage House residence hall.

"Based on the college's ongoing conversations with them and the evolution of our investigation, the FBI is initiating an investigation of the bias incidents that have occurred on the campus," Oberlin spokesman Scott Wargo said in an email.

A school-wide Peace Week had just begun when Oberlin canceled classes for the day.

School officials said in a letter to parents on Monday that they were investigating incidents of hate speech on campus over the last several weeks, "including racist, anti-Semitic, and homophobic defacing of posters that were advertising events and programming."

The letter to parents also said offensive postings had appeared via untraceable accounts on popular social media sites.

Wargo said Oberlin was "cooperating closely with the FBI in its investigation."

FBI Special Agent Vicki Anderson said she could not confirm or deny any ongoing investigations because of the agency's policy.

The FBI has arrested an Connecticut woman accused of threatening to carry out a mass shooting at a community college.

Amanda Bowden, 19, of East Haven, Conn., was taken into custody Tuesday.

Bowden is accused of threatening to commit a Newtown-style mass shooting at Gateway Community College in New Haven, Conn.

"As alleged, this defendent made a series of threats that described in great detail her intention to carry out a suicidal mass murder at a community college in New Haven," said U.S. Attorney David Fein.

According to federal authorities, Bowden made several threats by text message with a witness cooperating with investigators between Feb. 4 and Feb 16. She also had text message and verbal conversations with an undercover officer, discussing her plans to commit a mass shooting and bombing at Gateway, authorities said.

Bowden claimed to have guns and claimed that she had constructed at least two napalm-based bombs at her home in East Haven, according to Fein.

The FBI and New Haven police chief Dean Esserman notified Gateway Community College President Dorsey Kendrick about the threats on Feb. 5, according to a school spokesperson.

"Chief Esserman and GCC security had been contacted by the FBI, and were told that there was no imminent danger as a result of the post, but an investigation was underway," said Evelyn Gard. "The chief requested that Dr. Kendrick and GCC security keep the matter confidential until the investigation wa
s complete."

The FBI, the Justice Department's Civil Rights Division, and the U.S. Attorney's Office for the Middle District of Florida will investigate the killing of Trayvon Martin, an unarmed 17-year-old Florida high school student, who was shot by a self-appointed neighborhood watchman.

"The department will conduct a thorough and independent review of all of the evidence and take appropriate action at the conclusion of the investigation," a statement released by the Justice Department this evening said. "The department also is providing assistance to and cooperating with the state officials in their investigation into the incident."

George Zimmerman, who claimed self-defense in shooting Martin, has not been charged with any crime in the fatal shooting of the teenager on Feb. 26.

Outrage over the incident has only grown, as irregularities in the police investigation have been uncovered and 911 tapes released last week showed Zimmerman ignored a dispatcher's directive not to pursue the teen.

Zimmerman also blatantly violated major principles of the Neighborhood Watch manual, ABC News has learned.

The manual, from the National Neighborhood Watch Program, states: "It should be emphasized to members that they do not possess police powers, and they shall not carry weapons or pursue vehicles. They should also be cautioned to alert police or deputies when encountering strange activity. Members should never confront suspicious persons who could be armed and dangerous."

Yet Zimmerman made a nonemergency call to police and pursued him anyway, even though 911 dispatcher told him not to, before fatally shooting the teenager.

The Sanford, Fla., Police Department, relenting to massive public pressure, released parts of these 911 tapes pertaining to the shooting.

On the tapes, Zimmerman, claiming Martin looked intoxicated, says he saw the teenager cut through from the main street in the tidy Retreat at Twin Lakes, onto a path between two blocks of townhouses, and decided to gave chase. Zimmerman told a police dispatcher, "These a**holes, they always get away"

Dispatcher: "Are you following him?"

Dispatcher: "OK, we don't need you to do that."

Zimmerman didn't stop and ultimately confronted Martin, who was carrying a package of Skittles and a bottle of iced tea. The two allegedly scuffled. In a series of seven 911 calls, eyewitnesses reported that they heard a sort of howling. One caller said, "they're wrestling right in the back of my porch, one man is yelling help."

Then a gun shot rang out. The howling and yelling stopped.

Zimmerman wasn't arrested at the time, and ABC News has learned he was not given a drug or alcohol test that night -- standard in most homicide investigations.

Two men intent on attacking a military recruiting station to inspire Muslims to defend their religion from U.S. actions abroad were snared by FBI agents in a terror plot sting, authorities said Thursday. Abu Khalid Abdul-Latif, also known as Joseph Anthony Davis, of Seattle, and Walli Mujahidh, also known as Frederick Domingue Jr., of Los Angeles, were arrested Wednesday night after they arrived at a warehouse garage to pick up machine guns to use in the attack, an FBI agent wrote in a criminal complaint filed in U.S. District Court.
The machine guns had been rendered inoperable by federal agents and posed no risk to the public.
The two suspects appeared in federal court Thursday in tan prison garb and listened as prosecutor recited the charges against them. Detention hearings were set for Wednesday.
Their court-appointed defense lawyers declined to comment. The suspects could face life in prison if convicted.
Authorities learned of the plot early this month when a third person recruited to participate alerted the Seattle Police Department, the complaint said. Investigators immediately began monitoring the men, and the confidential informant continued to string them along by promising to obtain weapons.
The building, the Military Entrance Processing Station on East Marginal Way in Seattle, also houses a daycare. Recruits for all military branches are screened and processed there.