(CNN) -- Former Blink-182 drummer Travis Barker and singer-song artist Adam "DJ AM" Goldstein were in critical condition with extensive burns Saturday after a jet crash the night before that killed four people, authorities said.
Two of the four who died late Friday were passengers and two were crew members, the National Transportation Safety Board said in a statement.
The NTSB has sent a Go Team to Columbia, South Carolina, to investigate the crash.
The Learjet 60 crashed on takeoff at the Columbia Metropolitan Airport at 11:53 p.m. Friday.
Beth Frits, spokeswoman at the Joseph Still Burn Center, in Augusta, Georgia, said Barker and Goldstein arrived at the hospital early Saturday. She said both men had "extensive burns."
The burn center is the largest in the country, and the main one in the Southeast, she said.
Federal Aviation Administration spokeswoman Kathleen Bergen said the twin-engine, private jet was cleared for takeoff on a flight to Van Nuys, California, and began its takeoff roll a few minutes before midnight.
Air traffic controllers "saw sparks coming from the runway -- whether that was from the aircraft or its engines, we don't know," Bergen said Saturday.
The jet left the ground but crashed near the end of the runway on a road adjacent to the airport, she said.
There were no other aircraft on the runway and no vehicles on the road, Bergen said.
William Owens told CNN affiliate WIS-TV he was driving down Highway 302 when he said he saw a fireball go across the road.
"I didn't know what I had seen -- it was maybe 800 feet in front of me, but as I approached it closer though, I made out a fire. By then I was able to see the tail of the jet and I recognized it as a jet," Owens said.
Owens told the station he tried to get to the wreckage.
"It's in flames and the fuel is running across the road and I had to cross the fuel to get to the two guys that seemed to have been dumped on the highway," Owens said.
Owens told WIS-TV the two men were running around and pulling off clothing to put out the flames. He said he asked them if anyone else was on board the plane and they said four people were with them.
"We turned to the jet to try and see if there was anything we could do, but immediately, there was nothing anyone could do," Owens said.
Barker and Goldstein had played at a huge free outdoor concert in Columbia's Five Points district on Saturday night, WIS said.
The Five Points Association has released a statement saying that they are "deeply saddened by this event and our thoughts and prayers go out to the victim's and their families," WIS reported.
