A human rights official is warning that the methods being used by Kenyan authorities to tackle extremism on the country's coast will result in increased support for radicals.

Kheled Khalifa, the chairman of the group Muslim For Human Rights, said the closure of four mosques on the coast following police raids this week in which the government claimed to have recovered grenades and a gun has angered the Muslim population, which believes the government planted the weapons to justify the mosques' closures.

The government had previously cited the four mosques as centers for recruitment for the al-Qaida-linked Somali militant group al-Shabab, which has been blamed for more than 135 attacks on Kenyan soil since the country sent its troop into Somalia to fight the militants.