BANGKOK, Sept 11 — Security agencies are probing what persons or group is responsible for a grenade attack on an army camp two days ago in Chiang Mai, Deputy Prime Minister Suthep Thaugsuban said Saturday.

Mr Suthep said he had not yet received intelligence reports on who fired grenades into Khun Nen army camp in Chiang Mai’s Mae Rim district Thursday night.

Five grenades from an M79 launcher were fired into the army camp that night but only four exploded, and those were on the lawn of the facility. No casualties were reported.

MCOT