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A Greek boat carrying 280 passengers, mostly tourists, has run aground on a reef north of the Saronic Gulf island of Poros near Athens, officials say.

The boat is taking on water, but a helicopter and three coastguard vessels are on their way to evacuate those on board, all of whom are said to be safe.

It is not yet known why ship hit the reef, as the weather was very good.

The ship was on a daily excursion from the port of Piraeus to the nearby islands of Aegina, Poros and Hydra.

The mayor of Poros, Dimitris Stratigos, said the vessel was stranded about 3 nautical miles (5.5km) from the island's port.

"Thankfully, the weather conditions are good, and there doesn't appear to be any serious problem," he told the Associated Press.

Source: news.bbc.co.uk via ryan