• Debris from the EgyptAir flight from Paris to Cairo has been found 180 miles off the coast of Alexandria, including human remains and passenger belongings.

• The cause of the crash remains unclear, and terrorism has not been ruled out. Cairo is leading the investigation with help from France, the U.S. and U.K.

• The aircraft was carrying 56 passengers, including one child and two infants, and 10 crew.

CAIRO (Reuters) - Egypt said on Friday that its navy had found human remains, wreckage and the personal belongings of passengers floating in the Mediterranean, confirmation that an EgyptAir jet had plunged into the sea with 66 people on board.

President Abdel Fattah al-Sisi offered condolences for those on board, amounting to Egypt's official acknowledgement of their deaths, although there was still no explanation of why the Airbus had crashed.

"The Egyptian navy was able to retrieve more debris from the plane, some of the passengers' belongings, human remains, and plane seats," the Civil Aviation Ministry said in a statement .

The navy was searching an area about 290 km (180 miles) north of Alexandria, just south of where the signal from the plane was lost early on Thursday.

There was no sign of the bulk of the wreckage, or of a location signal from the "black box" flight recorders that are likely to provide the best clues to the cause of the crash.

EgyptAir Chairman Safwat Moslem told state television that the current radius of the search zone was 40 miles, giving an area of 5,000 sq miles, but that it would be expanded as necessary.

A European satellite spotted a 2 km-long oil slick in the Mediterranean, about 40 km southeast of the aircraft's last known position, the European Space Agency said.

Egyptian Prime Minister Sherif Ismail said it was too early to rule out any cause for the crash. The aviation minister said a terrorist attack was more likely than a technical failure, but offered no evidence.