A roadside bomb hit a Pakistan air force bus in a northwestern city Tuesday, killing at least 11 military personnel and wounding 10, police said.

The explosion hit the vehicle on a bridge on the outskirts of Peshawar, provincial police chief Malik Naveed Khan said. The bus was heading from the city to the nearby air force base in Badaber.

A suicide bomber detonated explosives Sunday amid U.S. and Iraqi troops who were investigating an earlier attack. Iraqi police said nearly 20 people died, and the U.S. military said they included one American soldier.

It was the day's worst attack among several that occurred across Iraq, including one at a crowded bus depot in Baghdad that left four people dead.

Blast in Bangalore, India

Two more servicemen, injured in an accidental ammunition blast, have died bringing the death toll to nine in Russia's North Caucasus Republic of Chechnya, a military source said on Wednesday.

Rejecting India's claim that the country's spy agency was behind the suicide attack on its embassy in Kabul last week, Pakistan on Sunday said it had no interest in whipping up that kind of an environment.