A massive law enforcement sweep was underway in Oakland Wednesday, with nine people having reportedly been detained an hour after it was first reported.

FBI agents, local police SWAT and the California Highway Patrol were targeting multiple locations.

Several streets were closed down in West Oakland during the sweeps. Portions of Seventh and Eighth streets were shut down in the area for at least 90 minutes and while helicopters circled overhead.

The police barricades were reportedly lifted just before 10:20 p.m.

It appeared to be an extensive operation with many officers involved.

There were agents carrying out actions in numerous parts of the city Wednesday night.

As of 9 p.m., KTVU learned that nine people had been detained.

An hour later, a separate sweep involving San Leandro Police reportedly resulted in a standoff near the intersection of E. 22 Street and 14th Avenue.

Oakland Police and other agencies involved told KTVU that the participating departments were not at liberty to discuss what the action concerned.

However, those agencies would be able to release details when the sweep was over. 

Follow this story for more updates.