Turkish police on Friday detained three people accused of insulting President Recep Tayyip Erdogan and other top officials on Twitter, after raiding their homes.

Turkish police on Friday detained three people accused of insulting President Recep Tayyip Erdogan and other top officials on Twitter, after raiding their homes.

The raids were the latest in a string of actions against critics of Erdogan on Twitter, as activists express growing alarm over the limits on freedom of expression in Turkey.

The three people, two of them women and identified as Veli H.K., Serpil I. and Serap K., were detained at their homes and are expected to face court hearings in the coming days, the official Anatolia news agency reported.

According to media reports, two were arrested in Istanbul and one in the resort of Fethiye in the Mugla province on the Mediterranean.

In a separate incident, police in the central Anatolian ciity of Kayseri also arrested a Turkish student who had been convicted of calling Erdogan a "dictator" during the protests in the summer of 2013 against his rule, the Hurriyet daily reported.

Aykulatap Avsar, who until now had been at large, was sent to a prison in Kayseri to begin serving a one year and two months jail sentence.