Pakistani officials say unknown gunmen have opened fire on a bus carrying the Sri Lankan cricket team, killing at least five police officers and wounding six Sri Lankan players.

Lahore police chief Habibur Rehman said at least 12 gunmen attacked the convoy near Lahore's Gaddafi stadium Tuesday with rockets, hand grenades and automatic weapons.  He called it a terrorist attack. 

Pakistan TV showed footage of gunmen running through the streets and firing on vehicles.

Sri Lanka's sports minister say at least five players and an assistant coach received minor injuries in the attack, including Kumar Sangakkara, Thilan Samaraweera and Tharanga Paranavithana.

Security concerns have plagued Pakistan for many years, and some foreign sports teams have refused to play in the country.

Some information for this report was provided by AFP, AP and Reuters.