Terrorists yesterday killed seven Amarnath pilgrims, including six women, and injured 19 others as they struck at a bus in Kashmir's Anantnag district.
The advisory, issued by the Special Cell, states that security should be stepped up at important and vulnerable places like crowded markets, malls, religious places, metro stations, etc.
The security has been specifically beefed up in areas of north and northeast Delhi, from where Kanwars (devotees of lord Shiva) started arriving in the city.
He added that the advisory has also been issued keeping in the mind that the Independence Day is round the corner.