A 440-pound dynamite bomb loaded with shrapnel exploded Saturday as thousands of people were leaving a bullfight, killing at least 20 people and wounding more than 60, police said.

"Legs and arms were hurled into the air," witness Luis Roberto Rodriguez told Colombia's RCN radio network. "It was chilling."At least 10 people, including five policemen, were killed instantly when the device was detonated, apparently by remote control, as thousands of people were leaving the La Macarena bullring in Medellin, 160 miles northwest of Bogota, radio and police reports said.

Ten more people died in nearby hospitals, Red Cross officials said. About 24 cars parked around the bullring were demolished, police said.

"It was all so peaceful and then we heard the explosion," said a sobbing woman who identified herself as Marina.

The explosion left a large crater in the middle of the street and ripped through power and telephone lines.