Twenty-three people trying to cross the Mediterranean to Europe from Tunisia have been missing for the past two weeks, the country’s National Guard said in a statement on Saturday. The National Guard, which oversees the North African country’s coastguard, said searches were still under way after the group departed in early May. “They set sail overnight between May 3 and 4” from the city of Nabeul, the statement said, adding that relatives of the missing only contacted the authorities 10 days later. Acting on orders from prosecutors in Nabeul, the National Guard said it had arrested five people…