A blast in Imphal, Manipur on Wednesday afternoon killed two Border Security Force jawans and injured two civilians critically, police said. The explosion took place near a BSF outpost close to the Koirengi Airfield in Imphal East district.

“The two jawans succumbed to their injuries in the hospital,” said Imphal East Police chief, K Meghachandra. “The two civilians include a local shopkeeper and a woman. Both are in critical condition.”

The police said a preliminary investigation suggested an improvised explosion device was used. None of Manipur’s militant groups have claimed the attack so far.

This is the second attack on paramilitary forces in the state in as many days. On Tuesday, two hand grenades were lobbed at an Assam Rifles facility in Imphal city, injuring a jawan attached to the force.