NAIROBI, April 11 (Reuters) - Pirates seized a U.S.-owned and Italian-flagged tugboat with 16 crew on Saturday in the latest hijacking in the busy Gulf of Aden waterway, a regional maritime group said.

Andrew Mwangura, of the Mombasa-based East African Seafarers' Assistance Programme, said the crew were believed to be unharmed on the tugboat, which he added was operated from the United Arab Emirates.

(Reporting by Andrew Cawthorne)

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