A search is under way for missing people in Balochistan's Lasbela after heavy rain caused flooding in the district. Flooding has been reported across the province but the worst hit district is Lasbela. An emergency has been declared and over 20 people have been reported missing, according to Lasbela Deputy Commissioner Shabbir Ahmed Mengal.Communication with with dozens of villages has been cut off due to the flooding and traffic has been stopped on the highway connecting Quetta and Karachi. Over 500 people have been stranded. Water has entered several houses, causing people to evacuate their homes.Rescue teams from the Pakistan Navy and Edhi are also taking part in the operation.Related: Seven killed, 10 injured in roof collapses after rain lashes PunjabHeavy rain and an overflowing storm water drain in Turbat led to the destruction of a bridge over the drain. This has led to contact between Turbat and Gwadar and the rest of the province being suspended.Damage to the Makran Coastal Highway near Ormara caused traffic between Karachi and Gwadar to come to a halt.The Provincial Disaster Management Authority has issued a high alert in Balochistan and cancelled the vacations of all its employees. Balochistan Chief Minister Jam Kamal has cancelled his three-day trip to Lasbela and has ordered rescue services across the province to be intensified.Government officials said four Pakistan Army helicopters are being used for rescue operations .Follow SAMAA English on Facebook, Twitter, and Instagram.