A Union flag flies at half-mast in front of the Big Ben clocktower in tribute to murdered Labour Party MP Jo Cox, in London, Britain June 17, 2016. REUTERS/Neil Hall

A Union flag flies at half-mast in front of the Big Ben clocktower in tribute to murdered Labour Party MP Jo Cox, in London, Britain June 17, 2016. REUTERS/Neil Hall

A Union flag flies at half-mast in front of the Big Ben clocktower in tribute to murdered Labour Party MP Jo Cox, in London, Britain June 17, 2016. REUTERS/Neil Hall

June 20, 2016 2:00 PM (UTC+8)