Work crews and employees of trashed buildings in downtown Oakland set to work this morning cleaning up from the post-midnight riot that broke out after Occupy Oakland’s daylong general strike.

Graffiti was spray-painted on many buildings along Broadway from 14th to 16th streets, where masked vandals shattered windows and threw objects at police. Officers responded by firing tear gas and flash-bang grenades and making dozens of arrests.

As the sun rose, downtown Oakland business owners were again assessing the damage, much as they did after a series of protests related to the killing of unarmed BART rider Oscar Grant in 2009. . .