ISTANBUL (AP) — Turkish officials and reports said that 49 migrants arrived in Turkey on Tuesday as part of a migration deal with the European Union.

Ferries carrying migrants from the Greek islands of Kos, Chios and Lesbos reached the Turkish port towns of Gulluk, Cesme and Dikili, according to Turkish news agencies and an official at Dikili, who spoke on condition of anonymity in line with government rules.

According to the deal finalized last month, Turkey is to take back migrants who reached Greece after March 20. For every Syrian returned, Europe has pledged to take a Syrian refugee directly from Turkey to be resettled in an EU country.

Tuesday's group of migrants, from Afghanistan, Iran, Pakistan and Myanmar, was the third wave of migrants to be returned to Turkey.

In Greece, a protest broke out in the Moria migrant detention center on Lesbos on Tuesday during a visit there by the Greek migration affairs minister and a Dutch official, with protesters, mainly unaccompanied teenagers, setting fires and riot police on standby.

A Greek official said Ioannis Mouzalas was visiting the camp with Dutch junior justice minister Klaas Dijkhoff when migrants began shouting "freedom" and "open the borders," and banging metal objects. The official, who spoke on condition of anonymity in line with department regulations, said the situation was tense.

The ministers left the camp, and police said unaccompanied minors in the camp had started fires, burning garbage. A riot police contingent was sent to Moria but was waiting outside and had not intervened, police said, adding that staff had left the camp and were waiting outside.

The Moria camp was converted into a closed detention center after the EU-Turkey deal was announced. Under the agreement, those arriving on Greek islands from March 20 onwards are detained and face deportation unless they successfully apply for asylum in Greece.

Elena Becatoros reported from Athens, Greece.