Update, 7:50 a.m. Thursday: The Oakland Police Department says 30 people were arrested and 11 cited during last night's anti-Trump disorders on downtown streets. The department also reports:
- Three officers injured. It's unclear how many protesters were hurt, but the OPD says there were five Oakland Fire Department medical calls related to the protest.
- Three Pleasanton police vehicles damaged. A dozen outside agencies joined Oakland police on the streets Wednesday.
- At least 16 episodes of vandalism and "a widespread of graffiti on walls downtown."
- Forty trash fires.
The Police Department also gave this account of its use of what some media outlets last night called "incendiary devices":
"OPD deployed several CS blast devises in an attempt to deter a violent portion of the crowd from assaulting officers with rocks, bottles, fireworks, M-80s, and Molotov cocktails."
That episode reportedly occurred around 8 p.m. when much of the crowd, now estimated at 7,000, was in the Old Oakland neighborhood near police headquarters.
The artifact the department refers to in its statement is a "CS blast dispersion grenade," a device designed, in the words of one seller, to deliver "a fine cloud of micro-pulverized CS powder."
CS gas or powder, one of the chemical commonly referred to as teargas, is used frequently enough that PBS "Frontline" provides a description of the substance and its effects: "A Primer on CS Gas."