Mexico City  - No one was injured in the hijacking of a plane Wednesday in Mexico, in an incident that ended about an hour after the aircraft landed in Mexico City.

"No bombs were found on board," Mexican Communications and Transport Minister Juan Molinar Horcasitas said.

The hijackers had allegedly threatened to detonate a bomb and demanded to speak with Mexican President Felipe Calderon.

Following negotiations, the attackers released most of the passengers. Federal police then stormed the plane at the Mexico City airport, arresting at least six suspected participants.

The Aeromexico plane, a Boeing 737 carrying 104 passengers, was flying from Cancun, the seaside resort city in south-eastern Mexico. According to released passengers, it was hijacked shortly before landing at Mexico City airport.

After landing, the aircraft remained isolated on a runway far from the airport's main building until the hijacking was resolved.

Passengers only knew of the hijacking after the plane landed, and they reportedly saw only one hijacker.

The alleged hijacker looked like "a normal, well-dressed passenger," Rocio Garcia told Mexican television after her release. "We did not immediately know what happened. It was all confusion, and then they told us that the plane was being hijacked by one person."

Adriana Romero, another released passenger, had a different perspective and saw no panic. "When we landed we were told to remain seated," she said.

At the time, passengers were told that the plane was being hijacked and that negotiations were ongoing, Romero said.

She described the hijacker as prosperous-looking, wearing a "good watch, a good shirt."

"He often stood up to take things out of his suitcase," Romero said. (dpa)