Three gunmen stormed a luxury hotel in Pakistan’s southwestern port city of Gwadar on Saturday, killing at least one security guard.
The attackers battled security forces inside the Pearl Continental Hotel, officials and the army said.
Separatist group the Baloch Liberation Army claimed responsibility, saying its four fighters were involved.
Most guests had been evacuated from the hotel, which helicopters circled as fighting was underway, Balochistan Home Minister Ziaullah Langove said.
He said there were reports of casualties, but did not give details.
The military said three gunmen killed a guard at the entrance to the hotel when they entered. Security forces had cordoned off the area and cornered the attackers in a staircase leading to the top floor, the army said in its statement.
Gwadar is a strategic port on the Arabian Sea that is being developed as part of the $60 billion (£46 billion) China Pakistan Economic Corridor, which is itself part of China’s mammoth Belt and Road infrastructure project.
The hotel, located on a hillside near the port, is used by foreign guests, including Chinese project staff, but there were none in the building at the time of the attack, Langove said.
Pakistani officials have said the security forces were on alert for attacks during the Muslim fasting month of Ramadan, which began in early May.
Security across most of Pakistan has improved over recent years following a major crackdown after the country’s worst attack, when some 150 people, most of them children, were killed in an attack on a school in the western city of Peshawar in 2014.
But Balochistan, Pakistan’s largest province, remains an exception and there have been several attacks this year, with at least 14 people killed last month in an attack on buses traveling between the southern city of Karachi and Gwadar.
The province is rife with ethnic, sectarian and separatist insurgencies, with several militant groups, including the Pakistani Taliban group Tehrik-i Taliban Pakistan (TTP), Balochistan Liberation Army and the Sunni group Lashkar-e-Jhangvi.
Saturday’s incident follows a bombing this week that targeted police outside a major Sufi shrine in Lahore, in the north of Pakistan, that killed at least 10 people and wounded more than 20, officials said.