One passenger from the flight was taken to the University of Michigan Medical Center in Ann Arbor, hospital spokeswoman Tracy Justice said. She didn't know the person's condition, or whether the person was a man or woman. She referred all inquiries to the FBI.

Passenger Syed Jafri, a US citizen who had flown from the United Arab Emirates, said the incident occurred during the plane's descent. Jafri said he was seated three rows behind the passenger and said he saw a glow, and noticed a smoke smell. Then, he said, "a young man behind me jumped on him."

Rich Griffith, a passenger from Pontiac, said he was seated too far in the back to see what had happened. But he said he didn't mind being detained on the plane for several hours. "It's frustrating if you don't want to keep your country safe," he said. "We can't have what's going on everywhere else happening here."

President Barack Obama was notified of the incident and discussed it with security officials, the White House said. It said he is monitoring the situation and receiving regular updates from his vacation spot in Hawaii.

J.P. Karas, 55, of Wyandotte, Mich., said he was driving down a road near the airport and saw a Delta jet at the end of the runway, surrounded by police cars, an ambulance, a bus and some TV trucks.

"I don't ever recall seeing a plane on that runway ever before and I pass by there frequently," he said.

Karas said it was difficult to tell what was going on, but it looked like the front wheel was off the runway.

"We encourage those with future travel plans to stay in touch with their airline and to visit http://www.tsa.gov for updates," Homeland Security Department said in a statement.

Homeland Security Secretary Janet Napolitano has been briefed on the incident and is closely monitoring the situation.

The department encouraged travelers to be observant and aware of their surroundings and report any suspicious behavior to law enforcement officials.