WASHINGTON (AP) - Federal officials say they arrested more than 3,100 immigrants convicted of serious crimes and fugitives in a six-day nationwide sweep.
    
Officials at U.S. Immigration and Customs Enforcement say the sweep included every state and involved more than 1,900 of the agency's officers and agents.
    
More than 1,000 of the people arrested had multiple criminal convictions. The most severe cases included murder, manslaughter, drug trafficking and sexual crimes against minors.
    
The totals included an estimated 50 gang members and 149 convicted sex offenders.
    
The sweep comes nearly a year after ICE pledged to focus on deporting illegal immigrants with serious criminal histories and those who posed national security threats, while going easier on many who stay out of

trouble.