By Maria Tsvetkova, Karen Freifeld and David Shepardson NEW YORK (Reuters) - The investigation into why a Mexican Navy training ship struck the Brooklyn Bridge on Saturday, shearing the top of its masts,

The National Transportation Safety Board, which is investigating Saturday's deadly crash of a Mexican Navy tall ship into New York's Brooklyn Bridge, is focused on the ship's guide tugboats and sudden acceleration.

Many crew members on the Mexican navy tall ship that suffered a deadly collision with the Brooklyn Bridge have flown home from New York, officials said Monday. Seven officers and 172 cadets who were aboard the Cuauhtemoc training vessel arrived early Monday at the port of Veracruz,