New Delhi, May 23 -- Idris al-Ridah wept as he carried the lifeless body of his 6-year-old son Amir, wrapped in a yellow and brown blanket, in northwest Syria.

The father collapsed to the ground as he laid his son to rest, his small body lowered into a grave next to two other young children who were siblings, Aya al-Fankih, 4, and Rayan al-Fankih, 6.

The three children were killed on Thursday in the village of Abu Habbah, in the countryside in the northwestern province of Idlib, when a land mine left behind from Syria's war exploded while they were playing near a well.

The deaths are the latest reminder of the dangers posed by unexploded war remnants scattered across the country years after the conflict began.

Mines and booby traps ha...