Militants lobbed a grenade in a busy market in the heart of the city, killing one person on Monday, almost three months since the Kashmir Valley shut down in response to the Centre revoking the special status of the erstwhile state of Jammu and Kashmir, police said.At least 13 people were injured in the grenade attack, the second in less than a month, and were rushed to the nearby SMHS hospital where the condition of two is critical, officials said.The attack took place at 1.20pm, a time the Hari Singh High Street market was crowded with people and roadside vendors. On October 12, terrorists injured five people in a similar grenade attack in the area.Security forces have cordoned off the area. Traffic was scarce in the city with the capital of the newly created union territory of Jammu and Kashmir shifting to Jammu for the winter.On August 5, the Centre announced the revocation of the erstwhile state's special status under Article 370 and the bifurcation of the state into two union territories, Jammu and Kashmir, and Ladakh.On Monday, almost three months to the day, normal life remained disturbed. Shops and other business establishments opened early in the morning but downed their shutters around 12 noon due to fewer customers following shifting of the capital to Jammu as part of bi-annual 'darbar move', officials said.While public transport was off the roads in most parts of the Valley, the movement of private vehicles in the city was less than usual as a large number of government employees have shifted base to Jammu.