Riyadh: Unknown assailants fired on a police patrol in Saudi Arabia’s Red Sea city of Jeddah late on Sunday, injuring an officer, the country’s official media reported on Monday.

Saudi Press Agency quoted an unnamed Makkah police spokesman as saying security forces were investigating the incident. He did not say whether Islamist militants, who have staged a series of attacks on police in Riyadh, were suspected.

Jeddah is the second largest Saudi city and a major port.

Daesh supporters have shot at two Saudi police patrols, bombed a mosque used by the security services and two other Shiite mosques, killing 40 people.

The Interior Ministry said last month it had detained 431 suspected supporters of Daesh and thwarted other attacks on mosques, security forces and a diplomatic mission.

Last year Daesh leader Abu Bakr Al Baghdadi called on his Saudi supporters to stage their own attacks inside the kingdom instead of travelling to join its forces in Syria or Iraq.

Saudi authorities describe Daesh as “deviant”, have detained thousands suspected of supporting it and joined air strikes against the group in Syria.