Pakistan ? Gunmen attacked a party office of opposition leader Benazir Bhutto in southwestern Pakistan today, killing three of her supporters ahead of parliamentary elections, police said.

The attack occurred in Naseerabad, about 150 miles east of Quetta, the capital of Baluchistan province, said Wajid Akbar, the district police chief. Police had no immediate information about the motive for the attack or who was behind it, he said.

Killings and other violence have been common in past elections in Pakistan, where Bhutto and others are now campaigning for parliamentary elections scheduled for Jan. 8.

Suicide bombers struck at Bhutto’s October homecoming parade in the southern city of Karachi, killing more than 140 people.

Pakistan’s political turmoil deepened on Nov. 3 when the country’s ruler President Pervez Musharraf imposed emergency rule.