Burning bus (file)
Burning bus (file)Israel news photo: Flash 90

Terrorists have struck in Pakistan for the second time in two days, killing seven people and wounding at least 20 others on a civilian bus.

The bomb was planted in a passenger bus traveling from Kotla to Kharian, a garrison town in the Punjab province. The town is located in northeastern Pakistan, about 130 kilometers southeast of Islamabad, the capital.

Eyewitnesses said the bomb was placed on the back seat of the bus. It was detonated near the Chak Kamala police station, according to Deputy Police Superintendent Mian Sultan. As fire from the blast lit the sky, the flames spread to a nearby wheat field, which also caught fire.

Residents in the area evacuated the wounded to local hospitals.

No group has yet claimed responsibility for the attack.

The blast followed by one day a double suicide bombing in the Charsadda district of Pakistan's northwest region that left 89 people dead, and 140 others wounded.

Friday's twin blasts targeted a paramilitary training center in the northwest part of the country. At least 70 of the dead were paramilitary recruits – the highest number of law enforcement personnel killed in a terrorist attack in the country.

The Tehrik-i-Taliban, who had threatened revenge against Pakistan and the U.S. for the May 2 assassination of Al Qaeda leader Osama bin Laden, said the bombing came as “first revenge.”