Pakistan: riot police fire teargas on crowds trying to prevent arrest of Imran Khan

It is the second time in recent weeks that police have been dispatched to serve an arrest warrant to the former prime minister

Pakistan riot police have used water cannon and teargas to push back supporters of former prime minister Imran Khan who gathered outside his house to prevent officers from arresting him.

Khan was ousted from office by a no confidence vote last year, and has been snarled in a series of legal cases as he campaigns for early elections and his return to office.