U.S. Marshals working with numerous local and state law enforcement agencies arrested 104 wanted violent suspects and gang members over a two-week period, including seven wanted for murder and attempted murder in Oakland, officials said Tuesday.

Charges against those arrested included murder, robbery, assault, sex crimes and probation and parole violations.

During the operation, which concluded last weekend, eight guns and amounts of cocaine, heroin and methamphetamine were recovered, officials said.

In a news release Tuesday, U.S. Marshal Don O'Keefe said those arrested were singled out because of their propensity to commit violence, whether through the crime itself or through their gang associations and their violent backgrounds.

O'Keefe said the operation, as with past similar operations, "continue to highlight the efforts and the ability of the federal government to fight crime at the local, as well as regional and national level."

The only Oakland suspect's name released was Alpacino McDaniels, 29, who is charged with murder in a July 2013 fatal shooting of a man in West Oakland. He was arrested June 17 in Rancho Cordova.

Besides various marshal task forces, 20 other law enforcement agencies participated in the operation. Among them were Oakland, Fremont, Vallejo, San Jose, and San Francisco police and the Contra Costa County Sheriff's Office.