WASHINGTON (AP) — Authorities are stepping up patrols on a trail between Washington and Maryland following a number of attacks in recent weeks.

Police say there have been four attacks, including assaults and robberies, on a stretch of the 8-mile Metropolitan Branch Trail that runs from Silver Spring, Md. to Union Station in Washington.

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The last incident occurred last week when two men tried to use a Taser on a bicyclist just south of Rhode Island Avenue.

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Police say they have not determined whether the attacks are related. The increased patrols will continue indefinitely.

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