Four people died and at least five were injured after a boat with about 20 people on board collided with a speedboat near a popular Greek holiday island.
The dead include the tourist vessel's captain and a nine-year-old girl, a coastguard spokeswoman said.
Three of the victims are Greek but the fourth, a man, has not been identified.
The collision happened off Aegina, an island near the capital where many Athenians have summer holidays, officials said.
The circumstances of the collision were unclear.
The Athens News Agency reported that the speedboat rammed into the tour boat and its captain had been arrested.
Among those injured is a 28-year-old woman who lost her lower leg in the incident, reports said.
Another 20 people were rescued, most of them Greek nationals.
"We saw over eight-nine people in the sea ... some were swimming, others were unconscious, dead," a witness told Greece's Mega broadcaster.
Another witness told Skai radio that the motorboat, which had four people on board, had sliced the launch in two as it sailed to a small islet off Aegina popular with swimmers.
