The vice-president of the Maldives has been arrested in connection with an alleged plot to assassinate the president. Ahmed Adeeb was in detention and being charged with high treason, Home Minister Umar Naseer said on Twitter. President Abdulla Yameen narrowly escaped injury when a blast struck the boat he was using to return home from the airport late last month. In recent years, the Maldives has been rocked by political infighting. Security has been tightened in the capital Male amid fears of "turmoil" triggered by the arrest, says the Maldivian newspaper Haveeru.