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, will look into a possible engine failure and the role of a tug boat that assisted it in backing out of its pier, officials said on Monday.

The ship's engine was the key focus for the National Transportation Safety Board, said Brian Young, who is leading the agency's investigation.

"We will look at the status of the engine, we will look for any failures, we will look for engine inspections and we'll talk to the crew on what may have possibly happened with the engine," Young said at a preliminary NTSB briefing. He said investigators would also look for any electronic control data.

The ac

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