BOGOTA, COLOMBIA, JUNE 28 -- A car bomb exploded outside a police station in the cocaine capital of Medellin today, killing 14 people and wounding 30, authorities said.

No one claimed responsibility, but authorities have blamed the Medellin drug cartel for a terror campaign of bombings and killings in Colombia's second largest city.

{Colombian military experts and police who monitor the activities of the Medellin cartel said their intelligence had detected the movement of large amounts of explosives in both Medellin and Bogota, the capital, and said they had been expecting a series of car bombings in recent days, special correspondent Douglas Farah reported from Washington. The officials said the car bombing could be part of a new offensive by the Medellin cartel.}

Security forces deactivated a car bomb loaded with a half-ton of dynamite in a parking lot near a city government office building in Medellin Wednesday night, police said.

In today's attack, witnesses said they saw a man running from a compact car parked in front of the police station minutes before the bomb exploded at about 11:30 a.m., according to radio reports.An unidentified eyewitness told Colombia's government-run radio, RCN: "The only thing I felt was a huge explosion that threw me from my car."

Four people were pronounced dead at the scene and the others died in hospitals, Bernardo Guerra, president of the Medellin government's Emergency Committee, told RCN. Medellin police said four of the dead and many of the injured were children. Many of the 30 injured were reported to be in critical condition.

The Bogota daily El Tiempo reported today that the government of President Virgilio Barco may have temporarily halted the extraditions of suspected drug traffickers to the United States.

The newspaper said there have been no extraditions for three months. It added that 15 Colombians facing extradition have been moved from secret police headquarters to La Picota prison, indicating that they will not be extradited soon. It said Barco may have suspended extraditions to allow President-elect Cesar Gaviria to decide his own policy when he takes office in August.