Gunmen kill four polio workers in Quetta, Pakistan

Authorities in Balochistan, Pakistan, have suspended a campaign against polio after four workers were shot dead by unidentified gunmen in the city of Quetta.

More than 60 Pakistani polio workers, or their guards and drivers, have been killed since 2012 - with most attacks blamed on Islamic extremists.

Shaimaa Khalil reports from Islamabad.