( CNN ) -- More than 200 dinghy sailors caught in heavy weather off the coast of Northern Ireland have been accounted for and have now returned to shore , the coast guard says . A rescue operation was launched Monday after news that 87 boats were in difficulty , at Strangford Lough inlet , in County Down . Twenty people ended up in the water , 10 of whom needed medical attention , with most showing signs of hypothermia , Liam Colquhoun of the Belfast Coastguard said . `` We have now been told by our rescue units on scene that everyone has safely returned to shore and that no one is missing , '' Colquhoun said . `` The weather conditions on scene have been pretty treacherous , with winds gusting up to 60 mph . '' In a statement earlier , the coast guard said that it had been alerted to the situation just before 2 p.m. ( 1 p.m. GMT ) . Two helicopters -- an RAF aircraft from Wales and an Irish coast guard helicopter -- were called to help , alongside vessels from the coast guard and Royal National Lifeboat Institution , or RNLI . Bernard Roddy , a volunteer for RNLI at the scene , told CNN that the weather had been good , but a random squall had hit , causing a large wave that overturned a number of dinghies . The East Down Yacht Club , based at Strangford Lough , is hosting the world championships for the GP14 class of sailing dinghy , with Monday the first day of racing . The boats are two-man recreational dinghies .
NEW : This means the product will ship as received by the manufacturer, sealed, with all advertised components, and with the manufacturer warranty. NEW : 10 people needed medical treatment , most for hypothermia , the coast guard says . Belfast coast guard was alerted about 1 p.m. GMT that some of the boats had capsized . East Down Yacht Club at Strangford Lough is hosting GP14 dinghies championships .