A car bomb on Sunday struck the Turkish city of Gaziantep, a major refugee hub near the Syrian border, killing at least two policemen and wounding 22 other people as the country reels from a succession of militant attacks.
On a day of violence dubbed "Black Sunday" by the press, three Turkish soldiers died in a separate attack in the province of Mardin to the east, in an ambush by Kurdish militants who have killed hundreds of security forces in a renewed insurgency since last year.
With Turkey on high alert for May Day celebrations, four suspected jihadists were detained in Ankara on suspicion of planning attacks and other May 1 events were cancelled elsewhere over security fears.