Details are starting to emerge in an early Friday confrontation near Oakland's Jack London Square, which ended in a crashed pickup truck and one Oakland police officer shot and critically wounded.

KTVU reports that a huge police response followed the shooting, which happened around 4:45 a.m. Friday. Dozens of OPD officers and Alameda County Sheriff's deputies were reportedly on the scene on Oakland's Embarcadero, near the intersection with 9th Avenue, by 5 a.m., not far from Jack London Square.

A white Toyota Tacoma truck was left at the scene with shattered windows and riddled with bullet holes, as KPIX reports. And bullet shell casings were seen near the southbound entrance to I-880.

Both on- and off-ramps to I-880 were closed in the vicinity as the investigation was taking place.

As Bay Area News Group reports, the officer was reportedly working under cover at the time of the shooting, and was critically wounded.

Update: The plainclothed, under-cover officer was reportedly one of several officers, some in uniform, who responded to a report of a burglary at a cannabis dispensary, as the Chronicle is reporting.

The officers were reportedly "ambushed" after spotting multiple suspects, and the one officer was fatally shot.

"This is a terrible tragedy for the men and women of the Oakland Police Department," said Barry Donelan, president of the Oakland Police Officers' Association, in a statement. "As every Oakland police officer grieves the loss of our colleague, let's be clear that no stone will be left unturned in an effort to find the culprits to bring them to justice in this case."

Police commanders, union representatives, and Mayor Sheng Thao were all reportedly at Highland Hospital Friday morning, where the officer was being treated.

The OPD is expected to give a press conference about the incident soon.

This is a developing story.

Photo: Justin Sullivan/Getty Images