The kidnapping took place soon after Somali gunmen seized two Western female tourists in separate incidents from beach resorts in northern Kenya and took them to the anarchic Horn of African nation.”Two female aid workers working for MSF were this afternoon kidnapped by suspected al Shabaab militants in Dadaab refugee camp in Garissa,” North Eastern Province police commander Leo Nyongesa told Reuters.”We’ve mobilized all the officers and alerted those at the border to ensure that no vehicle exits the country to Somalia. The whole border area is now sealed,” he said.MSF confirmed the attack on its staff at Dadaab on Thursday morning and said a driver had been injured.”He’s currently hospitalized and stable. Two international staff are missing. A crisis team has been set up to deal with this incident,” MSF said in a statement.Dadaab was set up in 1991 to house Somalis fleeing violence in their country. It has since grown to become the world’s biggest refugee camp with more than 400,000 residents.