Dehradun: Heavy rains and landslides have blocked many roads in the hill state of Uttarakhand, an official said on Wednesday. The roads include the Kedarnath highway and the Badrinath highway at Nandprayag. Efforts were on to clear the roads and bring the disrupted traffic back to track, the official said. "The Border Road Organisation is trying its best to clear these roads as many pilgrims of the Chaar Dhaam Yatra have been stranded at various places due to the block" an official said. Meanwhile, the state's Met department has sounded a 72-hour alert for heavy rains beginning June 30. The districts where the alert has been sounded include Almora, Pauri, Uttarkashi, Dehradun, Udhamsinghnagar, Champawat and Nainital. So far, most parts of the state have received moderate rainfall.