Pakistani officials say a suspected U.S. drone strike has killed up to 12 militants in the North Waziristan tribal region.

The attack Monday on a compound took place in a village near the Afghan border.

Also in the northwest, a suicide bomber killed seven people and wounded at least 25 others at a political rally in the Batgram district of Khyber-Pakhtunkhwa province. The bomber blew himself up before a senior member of the Pakistan Muslim League-Q party, Ameer Muqam, was scheduled to speak at the gathering.

Elsewhere in Pakistan, an explosion ripped through an army weapons depot near the capital, Islamabad, killing one soldier and wounding at least three people.

The military said the blast at the weapons depot was accidental.

In the southwest, gunmen on motorcycles near Quetta, the capital of Baluchistan province opened fire on a truck carrying supplies for NATO troops in Afghanistan. The assailants killed the driver and another man set fire to the truck.

Also Monday, the outgoing head of the International Committee of the Red Cross delegation in Pakistan reported a significant increase in violence throughout Pakistan since the killing of former al-Qaida leader Osama bin Laden in a U.S. raid in Abbottabad on May 2.

Pascal Cuttat told VOA in Geneva that about 1 million people are currently displaced in Pakistan due to fighting in the tribal areas and in Khyber-Pakhtunkhwa and Baluchistan provinces along the Afghan border. Cuttat said the ethnic, political and religious divisions in Pakistan have become more complicated and instability has increased since bin Laden was killed.

He said another effect of the U.S. raid is an increased suspicion of foreigners in the country, including aid workers. He said this suspicion has made it more difficult for foreign workers to move around Pakistan.