(NECN: Boston, Mass.) - Authorities held a news conference in Boston, Massachusetts on Thursday morning on the capture of James "Whitey" Bulger.
U.S. Attorney Carmen Ortiz said the arrests of Bulger and his longtime girlfriend Catherine Greig mark the end of a long, exhaustive hunt.
The FBI finally caught 81-year-old Bulger on Wednesday night -- after the Boston Mob boss was on the run for 16 years.
Bulger and Greig were captured at an apartment in Santa Monica, California. The arrests came just days after the government launched a publicity campaign to locate the fugitive crime boss and his girlfriend. The arrests were based on a tip from the campaign.
Bulger is wanted in connection with 19 murders. Federal officials say the pair was arrested without incident.
Ortiz says the pair were using the aliases Charles and Carol Gasko.
Bulger had been listed as No. 1 on the FBI's Ten Most Wanted List after Osama bin Laden was killed.