A high alert was sounded in the city on Thursday with authorities suspecting the presence of more militants here after three infiltrators were killed by security forces during a 19-hour hostage drama.

Security has been beefed up in areas along the IB and LoC and police has intensified frisking and checking of vehicles with all entry and exit points in the city being sealed.

"There could be more infiltrators hiding in some other areas on the outskirts of the city and the need is to maintain vigilance," Director General of Police (DGP) Kuldeep Khoda said.

A high alert has been sounded here and police stations have been asked to monitor the sitution round the clock in their respective areas, he said.

Search and combing operations have been lauched in Muthi, Gajansoo, Marh, Akhnoor, Gharota, Hiranagar and other places, including the adjoining border areas, were on, Khoda said.

Besides screening of vehicles is being done by multi-tier security agencies, including the CRPF and Army, he said.

Security has been beefed up along the Pathankote-Jammu-Udhampur railway line and stations, Deputy Inspector General, Railway, Niaz Mehmood said.

The Army has been deployed for the purpose as an important section of the track runs close to the Indo-Pak border in Samba and Hiranagar districts, he said.

Security forces had killed three militants who held 11 people captive for 19 hours in a house near Jammu on Wednesday.

Three of the hostages were killed while the others, including four children, were safe.