Gunmen attacked a Pakistan naval airbase, killing at least one paramilitary soldier, while security forces killed all five of the assailants in retaliatory fire, officials said on Tuesday.
Monday's attack on the Turbat base in southwestern Pakistan was the second assault by ethnic Baloch people on a military facility in the past week.
"We escaped a huge loss," said a statement from Prime Minister Shehbaz Sharif's office.
A Pakistan Navy spokesman said all five attackers were killed after they tried to break into the base.
One paramilitary soldier was also killed, according to a military statement.
The Baloch Liberation Army (BLA), the most prominent of several separatist groups in Balochistan, claimed responsibility for the assault in a statement.
Previous attacks done by the BLA
The BLA has previously been involved in attacks on Pakistani and Chinese interests in the region and elsewhere.
China has invested heavily in the mineral-rich southwestern province of Balochistan, which borders Afghanistan and Iran, including developing the port of Gwadar, despite a decades-long separatist insurgency.
The naval base is significant to the China-Pakistan Economic Corridor, which also encompasses roads and energy projects and is part of Chinese President Xi Jinping's Belt and Road Initiative.
Pakistani security forces said last week they repulsed a gun and bomb attack by the BLA on a complex outside Gwadar, in which two soldiers and all eight gunmen were killed.