At least 16 suspected militants and one soldier were killed in clashes in northwestern Pakistan's Swat Valley, the military said Sunday as it escalated its offensive against insurgents in the one-time tourist haven. Swat lies outside the tribal regions along the Afghan border where the Taleban and Al-Qaida have traditionally had their strongholds. Residents say militants now control most of the valley, despite an army operation that began more than a year ago. The latest clashes broke out in several parts of the valley over 24 hours, according to a military statement that detailed the casualties. It said troops “consolidated their hold” over Charbagh, an area considered a militant stronghold. Separately, militants fatally shot a police constable they had abducted in Rahimabad, a city in the Swat Valley, the statement said. Meanwhile, a police official said a grenade attack killed one person and wounded five others in southwestern Pakistan. The attackers – two motorcyclists – lobbed a hand grenade at a police patrol in Baluchistan province Saturday night, but hit bystanders instead, Ghulam Ali Lashari said. No one claimed responsibility for the attack in Khuzdar district, about 185 miles (300 kilometers) south of the provincial capital, Quetta. However, Baluch nationalist groups often attack security forces. The groups are involved in a low-level insurgency seeking greater provincial autonomy and a larger share of revenue from the region's natural resources.