Pakistani authorities say a string of bomb explosions in the southern port city of Karachi has killed one person and wounded 37 others.

Police say six low intensity bombs were detonated within an hour of each other Monday in Pashtun-dominated neighborhoods.

Local authorities say the explosions may have been aimed at creating ethnic tension and panic in the city.

No one has claimed responsibility, but police say they have detained five men in connection with the blasts.

Karachi has seen a number of attacks blamed on various militant groups since Pakistan joined the U.S.-led war on terror.

In October, former Prime Minister Benazir Bhutto narrowly escaped a suicide attack in the city during her homecoming parade, but the bomber killed 140 people at the rally.

Meanwhile, police investigating Sunday's suicide attack near the radical Red Mosque in Islamabad said they found the severed head of the suicide bomber responsible for the blast, which killed 18 people.

The attack took place shortly after several thousand Islamists had rallied nearby to mark the first anniversary of an army siege and raid on the Red Mosque. Officials said most of the victims were police.

President Pervez Musharraf condemned the bombing as a terrorist act.

Some information for this report was provided by AFP and AP.