Services held across the world in remembrance of the 9/11 attacks

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Commemorations have been held in respect of the victims of the September 11 attacks in 2001.

15 years to the day of the world's most infamous terrorist attack, which killed nearly 3,000 people, crowds have gathered to pay their respects.

Pictures and roses were left in commemoration at the National September 11 Memorial in New York.

A photograph and roses decorate a name carved into the north pool of the National September 11 Memorial

At the ceremony held at the memorial, some were overwhelmed by emotion.

A man becomes emotional during a moment of silence at a 9/11 ceremony

A woman becomes emotional during a moment of silence at the 9/11 memorial ceremony

Nearby, in New York's Yankee Stadium, an American flag was unfurled during a memorial ceremony before the Yankees' baseball game against Tampa Bay Rays.

An American flag is unfurled on the field during a September 11th memorial ceremony at the Yankee Stadium

While two team-members laid a wreath in Monument Park.

Yankees team members carry a wreath

Meanwhile in London wreaths and bunches of flowers were left in Grosvenor Square Garden near the US Embassy.

Floral tributes in Grosvenor Square Garden

Floral tributes in Grosvenor Square Garden