A devastating storm system moved across the United States on Friday, spawning a slew of tornadoes that contributed to at least 28 fatalities in Indiana, Kentucky and Ohio.

National Weather Service meteorologist John Gordon reported Friday afternoon the agency had about "half a dozen reports of tornadoes on the ground," as well as reports of "significant damage" -- making his comments before some of the worst twisters were reported.

"This is an enormous outbreak that's going on right now across Kentucky and the South," Gordon said. "It's crazy. It's just nuts right here."

Southern Indiana was particularly hard hit, with Indiana Department of Homeland Security spokesman John Erickson saying three had died in Jefferson County as a result. Sgt. Rod Russell with the Indiana State Police said later that three people also were killed in Scott County.

In addition, Emergency Management Director Leslie Cavanaugh of Clark County -- which has about 110,000 people -- reported one death. Sheriff's Department Maj. Chuck Adams added that a man was found dead in his car several miles outside Henryville.

"We've got total devastation in the north-ceindntral part of the county (and) widespread damage from the west to the east," added Adams. "We are inundated with calls."

At least 15 people were killed across Indiana, authorities said.

Aerial footage from CNN affiliate WLKY showed structures torn to shreds and large swaths of trees knocked down in Henryville, about 20 miles north of Louisville, Kentucky.

Other aerial images showed similar devastation in St. Paul, Indiana. Several officials -- including Jeffersonville, Indiana, Mayor Mike Moore, U.S. Sen. Dan Coats and Adams -- indicated that the town of Marysville suffered especially significant damage.

Cavanaugh also said that the local high school, Henryville Junior-Senior High School, had been "demolished."

According to Sara Reschar, an administrative assistant for the West Clark Community Schools, "students were already out of the school when the storm hit" -- having been dismissed about 15 minutes earlier. Adams said there were some "scrapes and scratches," but no serious injuries as a result.

Authorities used thermal imaging equipment, search dogs and other means Friday night to look for a 9-year-old boy in Henryville whose whereabouts was unknown after the tornadoes came through, Adams said.

A cellphone of Osama bin Laden's trusted courier recovered in the U.S. raid last month that killed both men in Pakistan contained contacts to a militant group that is a longtime asset of Pakistan's intelligence agency, The New York Times reported late Thursday.

In a story posted on the Times website, senior American officials and others briefed on the findings said the discovery indicates bin Laden used the group, Harakat-ul-Mujahedeen, as part of his support network inside Pakistan.

It raises questions about whether the group and others helped shelter and support the al-Qaida leader on behalf of Pakistan's spy agency.

The officials and analysts told the Times that Pakistan's intelligence agency had mentored Harakat and allowed it to operate in Pakistan for at least 20 years.

In tracing the calls on the cellphone, U.S. analysts have determined that Harakat commanders had called Pakistani intelligence officials, the senior American officials said. One said they had met. The officials added that the contacts were not necessarily about bin Laden and that there was no "smoking gun" showing that Pakistan's spy agency had protected bin Laden.

Beyond providing leads about why bin Laden was able to live comfortably for years in Abbottabad, a town dominated by the Pakistani military just 35 miles from the capital city of Islamabad, the discovery also may help shed light on bin Laden's secret odyssey after he slipped away from U.S. forces in the Tora Bora region of Afghanistan nearly 10 years ago.