Eighteen people were injured on Thursday when a grenade exploded at a bus stop in the Indian city of Jammu, in the restive state of Jammu and Kashmir, police said.

"It seems that the grenade was lobbed from outside (the premises) and it rolled under the bus and caused injuries to approximately 18 people," police official MK Sinha told journalists.

The blast comes amid heightened tensions between India and Pakistan after 40 Indian troops were killed on February 14 in the part of Kashmir that New Delhi controls, triggering tit-for-tat air strikes by the two countries last week.

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