Landslides and flash floods triggered by heavy rains over the last two days has led to the closure of more than 280 roads in Himachal Pradesh, with 150 being closed on Saturday, according to officials. Water from overflowing streams has entered several houses in Una while the Lahaul and Spiti police have issued an advisory for residents and travellers to exercise extreme caution and not to cross the Jahalman Nallah as its water level is "rapidly" rising, they said..