ISLAMABAD, July 13 (Xinhua) -- At least four people were killed and 24 others injured when a blast hit a convoy of a political party leader in Pakistan's northwest Khyber Pakhtunkhwa province on Friday, local reports said.

The political party leader, Akram Khan Durrani, was on his way to attend a public gathering when his convoy came under attack in Bannu area of the province, Dunya News said.

The politician was about 50 feet away from the gathering site when his convoy was attacked, police said.

The former chief minister of Khyber Pakhtunkhwa escaped unhurt as he was traveling in a bomb-proof vehicle. However, people on three other vehicles of his convoy got injured.

The blast was triggered off by a remote controlled device and the explosive materials were fixed on a motorbike.

The injured people were shifted to a nearby hospital where five of them are said to be in critical condition.

Political leaders from across the country are busy in holding political rallies to make a mark in the forthcoming elections scheduled on July 25.

Earlier on Tuesday, 20 people including a political leader were killed and scores of others injured in Khyber Pakhtunkhwa province in a blast.