An alert has been sounded in the plain belts of Meghalaya as incessant rains since Monday triggered flash floods in several parts of the north eastern state washing away aperson and causing a series of landslides, besides inundating roads and cropland. One person was washed away and six houses were destroyed in West Garo Hills district in the flash floods, official sources said today. Most of the rivers like Jinjiram, Ganol and Simsang were in spate, nearing the danger level. Road blocks were reported from the Garo Hills region and one bridge was washed away by the flood waters at Purakhasia area, the sources said. The administration has asked the concerned agencies like police, disaster management team and home guards to be on alert.