He was travelling to provide security to polio workers when he was gunned down."
Islamabad, Aug 19 - At least three policemen were gunned down Tuesday in Pakistan's Karachi city, media reported.
Unidentified gunmen shot dead a policeman in Baldia area early Tuesday, Dawn online reported. The deceased policeman was a head constable deployed at a checkpost.
He was travelling to provide security to polio workers when he was gunned down.
In a separate incident, two policemen - a head constable and a constable - who were on a routine patrol were gunned down near Quaidabad by unidentified assailants.