At least two police personnel were killed and several others injured in a powerful explosion when a suicide bomber ploughed his explosive-packed vehicle into at a police station in Bannu district of northwest province of Khyber Pakhtoonkhwa on Tuesday morning.

According to police officials, the blast was so powerful that it not only harmed the premises of Haveed Police Station and but the windowpanes and the doors of nearby houses were also smashed.

The bombing was followed by intense gunfire. Law-enforcers including police personnel cordoned off the entire area and shifted the bodies and the injured to nearby hospital.

District Police Officer (DPO) Bannu Waqar told the media that only four police personnel were wounded in the blast.

Banned terror outfit TTP immediately claimed responsibility for the attack.

"We carried out the suicide attack on the police station... we will not spare them and target them again," Taliban spokesman Ehsanullah Ehsan told a foreign news agency on phone from an unknown location.

"We will continue to target police and security forces because they are killing our mujahedin (fighters)," he added.

Suicide and bomb attacks blamed on insurgents have killed more than 5,200 people across the country.