A policeman was killed and 10 others including an officer were injured in a grenade attack at Jammu and Kashmir's Nowhatta this evening. A police party was attacked near a police station in Nowhatta in downtown Srinagar when cops were returning from duty today around 7 pm. "There was stone pelting in the area and a police party came under grenade attack. One policeman was killed," said Imtiyaz Ismael Parray, a senior police officer in Srinagar.