The details are sketchy, but we know this much: A Portland police officer killed a man tonight, after the suspect apparently attacked with a knife.

Shortly after 6 pm, Portland police sent out a release saying a suspect had been shot when officers confronted him while responding to a burglary call near SE 130th and Sherman. Now, police have offered a more-concrete version of events—one that still leaves a lot of questions unanswered.

Cops now say officers responding to the burglary call arrived to find the caller attempting to restrain a suspect.

"Officers attempted to take custody of the suspect, who attacked them," the release says. "The suspect attempted to stab one of the officers with a knife. The officer fired two rounds, striking the suspect."

It's unclear right now what type of building the confrontation took place in—some media reports say it occurred near an apartment complex—and whether the dead man was a stranger to the person who called police. Police also aren't releasing any information about the suspect, saying they'll provide updates tomorrow.

It's even unclear if it was a burglary. According to the Oregonian, police Sergeant Greg Stewart says "the circumstances were 'chaotic,' and the exact nature of what led to the call remain under investigation."

The incident marks Portland's first deadly police shooting of 2015, and the first since Officer Robert Brown shot Nicholas Davis, a homeless man, on the Springwater Corridor Trail last June. In that case, Davis approached officers with a crowbar, and Brown fell to the ground while attempting to retreat. When Davis kept coming, Brown fired.

We'll have more on this on Monday.