Security forces on Monday launched a massive cordon and search operation to track down terrorists responsible for the attack on a passenger bus in Jammu and Kashmir's Reasi district that left nine people dead, officials said.

The bus carrying pilgrims from Uttar Pradesh and Delhi plunged into a deep gorge after an ambush by terrorists on Sunday evening.

The terrorists opened fire at the 53-seater bus when it was en route from Shiv Khori temple to Mata Vaishno Devi shrine at Katra near Teryath village in Poni area and it plunged into the deep gorge following the gunfire.

Security forces, including the Army, police and Central Reserve Police Force (CRPF), have laid multi-dimensional cordon of the Teryath-Poni-Shiv Khori area bordering Rajouri district, they said Armed with surveillance equipment, including drones and sniffer dogs, a massive combing operation has begun in the area and adjoining areas of the district, the officials said.

Terrorists involved in the attack are believed to be hiding in the upper reaches of neighbouring Rajouri and Reasi, the sources said, adding the area has dense forest belts and deep gorge.

"Search operation has been launched in the area", Senior Superintendent of Police, Reasi, Mohita Sharma said.

The village defence committees have also been geared up in the area, she added.

Officials said over 40 people were injured in the attack and 10 of them sustained bullet wounds.

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