Thousands of people have fled the town of Palma in northern Mozambique after an attack by Islamist insurgents on Wednesday, according to human rights groups, while the fate of dozens of people who had taken refuge in a local hotel remains unclear.Thousands of people have fled the town of Palma in northern Mozambique after an attack by Islamist insurgents on Wednesday, according to human rights groups, while the fate of dozens of people who had taken refuge in a local hotel remains unclear.