A woman was in police custody Sunday after authorities were called to investigate reports of a shooting as thousands of people gathered for the 2018 Rock 'n' Roll San Diego Marathon, according to multiple reports.

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An unidentified city official confirmed to KNSD that authorities were responding Sunday morning to reports of an active shooter at the City Hall Parkade, near the marathon route. It was not immediately clear whether a shooting had taken place.

A woman was in custody following the incident, KSWB reported.

A San Diego police officer was hospitalized after what KNSD described as a self-inflicted gunshot wound to the leg.

He is expected to make a full recovery.

Marathon runners were rerouted as police investigated the reported shooting, although KNSD reported that the run was allowed to continue as normal after authorities determined there was no longer any threat Sunday afternoon.

Photos posted on social media showed a heavy police presence downtown after reports of the shooting first surfaced just after 11 a.m. local time.