Screengrab via KRON 4.

Early Wednesday morning, several people were wounded in a shooting that took place in San Francisco’s Potrero Hill neighborhood, according to ABC News. At least three people were struck, though there may be more.

A huge police response has gathered near 17th and Vermont, close to a UPS facility, which seems to be the source of the gunfire. Victims have been brought to the hospital, and 5KPIX reports that police started telling people to avoid the area around 9 a.m. PT, advising local residents to shelter in place.

Police have not yet lifted the advisory that people shelter in place. This is an ongoing story and will be updated.

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Update 2:26pm ET:

UPS has released a statement:

UPS confirms there was a shooting incident involving 4 employees within the company’s facility in San Francisco earlier this morning. Local law enforcement are conducting an investigation. We cannot provide information as to the identity of persons involved at this time, pending the police investigation. We understand that there are potentially multiple deaths, although some individuals were transported to the hospital and we are unsure of their status at this time.

The company is saddened and deeply concerned about affected employees, family members and the community we share. Our thoughts and prayers are with all those touched by this incident.

Shelter-in-place remains in effect, as there appears to be a large number of officers in the area: