KUALA LUMPUR - Thirteen people, including two women, were injured after a grenade exploded in front of the Sun Complex in Jalan Bukit Bintang on Thursday.

Berita Harian Malaysia said police confirmed that among those injured are Singaporean, Thai and Chinese tourists.

Police said they received information of the blast outside a pub at about 4.30am, The Star newspaper reported. Four cars were damaged in the explosion.

City deputy CID chief Asst Comm Khairi Ahrasa said gangsters could have been behind the explosion, believed to be from grenades, but police are investigating the case from all angles.

A car jockey was seriously injured and is under intensive care at Hospital Kuala Lumpur. said The Star. Twelve others were injured in the blast and have been warded at Hospital Kuala Lumpur and the nearby Tung Shin Hospital.

"Some of the victims were about to board a Toyota Vellfire when an explosive device fell onto them from the second floor of a building," said ACP Khairi

"The victims were patrons of a pub and residents of nearby hotels.

"A Toyota Camry, Mazda and BMW were also damaged in the explosion," he added.

It is learnt that the explosion came from underneath a car that was parked in the area. Another unexploded device, also believed to be a grenade, was found underneath another car, a Toyota Camry.

It is learnt that two explosive objects were thrown at the scene from the second floor of a building.

The case has been classified as attempted murder under the Firearms Act.