Three supporters of Pakistan opposition leader Benazir Bhutto were killed Saturday when gunmen attacked her party's office in a town in southwestern Pakistan, police said. Officers were investigating the incident, which occurred in Naseerabad, about 250 kilometers (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 was quoted as saying by the Associated Press.