Jammu & Kashmir, 22/4: Security forces have killed four militants in an encounter at the Shopian district of South Kashmir on Tuesday. The militants first attacked the security forces. The militants were part of the terror outfit Ansar Ghazwat-ul-Hind. One of the dead militants was a top leader of the terror outfit. A joint team of Army’s 55 RR, police in Shopian and CRPF laid a siege at Melhora village late Tuesday evening.