One dead after Interstate 580 motorcycle crash

One person is dead following a Sunday afternoon motorcycle crash on westbound Interstate 580 between Livermore and Tracy, authorities said.

The crash happened around 1:06 p.m, when a motorcycle and SUV collided near the Grant Line Road off-ramp. A third vehicle hit the motorcycle rider shortly after the incident was reported, according to the California Highway Patrol.

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The left and center lanes were blocked by the crash, prompting CHP to issue a severe traffic alert. There was no estimated time to reopen those lanes.

It is unknown if weather was a factor in the crash. The CHP and Alameda County coroner’s office are investigating the incident.

Gwendolyn Wu is a San Francisco Chronicle staff writer. Email: Twitter: @gwendolynawu

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