ISLAMABAD (AP) — A gunman opened fire at a campaign truck carrying Pakistan’s former Prime Minister Imran Khan on Thursday, wounding him slightly and also some of his supporters, a senior leader from his party and police said.

Party official Asad Umar said Khan was wounded in the leg and was not seriously hurt. The identity of the gunman, who was arrested at the scene, was not immediately known. No group has claimed responsibility for the shooting.

According to police, the attack happened in the Wazirabad district in the eastern Punjab province where Khan was traveling in a large convoy of trucks and cars heading towards the capital, Islamabad, as part of his campaign aimed at forcing the government to hold early elections.

Khan with later seen with a bandage on his right leg, just above the foot, according to reports and a blurry image. He was moved to another vehicle from his container truck, from where announcements were being made that he was safe.