Migrants and refugees stand next to burning house containers at the Moria refugee camp, on the northeastern Aegean island of Lesbos, Greece, Sunday, Sept. 29, 2019. Migrants protesting at an overcrowded camp on the Greek island of Lesbos set fires and clashed with police Sunday, authorities said. Police and local authorities said there were unconfirmed reports of two fatalities at the Moria camp. (InTime News via AP)

Migrants and refugees stand next to burning house containers at the Moria refugee camp, on the northeastern Aegean island of Lesbos, Greece, Sunday, Sept. 29, 2019. Migrants protesting at an overcrowded camp on the Greek island of Lesbos set fires and clashed with police Sunday, authorities said. Police and local authorities said there were unconfirmed reports of two fatalities at the Moria camp. (InTime News via AP)

ATHENS, Greece (AP) — Migrants protesting at an overcrowded camp on the Greek island of Lesbos set fires and clashed with police Sunday, killing at least one person, authorities said.

A burned body was brought to a local hospital and there is information about an unconfirmed second death, police said. The protesters were demanding to be transferred to the Greek mainland.

“The situation is tense,” Lesbos mayor Stratis Kytelis told The Associated Press earlier. “There is information about a dead mother and her child. We haven’t been able to confirm that yet.”

UNHCR Greece later tweeted that “we learned with deep sadness that the lives of a woman and a child were lost in a fire on (Lesbos) today.”

Greek police spokesman Lt. Col. Theodoros Chronopoulos told the AP that the migrants set a blaze at an olive grove outside the camp just before 5 p.m. (1400 GMT; 9 a.m. EDT) and, minutes later, inside the camp. Kytelis said that both fires were later extinguished.

Police said Deputy Citizen Protection Minister Lefteris Oikonomou, a former chief of the Greek police, was going to Lesbos.

About 12,000 migrants, most of them Afghans, are housed in a space designed for 3,000.

Separately, Greek police said a speeding car carrying 12 Afghan migrants ran through a red light and crashed into a vehicle coming from a side street, killing its driver, a 64-year-old Greek man.

Police said one migrant was seriously injured and three others were slightly injured in the crash Sunday morning on a road between Kavala and Thessaloniki in northern Greece. Some of the migrants were found in the sedan’s trunk.

The driver of the car with the migrants has been arrested. Police said he is a 25-year-old Moldovan trafficker who was taking migrants toward Thessaloniki, 22 kilometers (14 miles) to the west.

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When asked by the AP whether the trafficker’s car was being pursued, a police spokesman said that wasn’t the case. But other police officials said the car might have been monitored by authorities in an unmarked vehicle. All spoke on condition of anonymity because the case is ongoing.

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Costas Kantouris reported from Thessaloniki.

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Follow Costas Kantouris on Twitter: https://twitter.com/CostasKantouris