The phrase "massive manhunt" means a widespread and intense search conducted by a large number of people in order to find and capture a specific individual, usually a criminal or a fugitive. Full definition
The city of Boston is currently under lockdown as police conduct a massive manhunt. (relevantmagazine.com)
The staff of The Boston Globe won the Pulitzer for Breaking News Reporting for their coverage of the Boston Marathon bombing, its aftermath and the massive manhunt that followed. (relevantmagazine.com)
A federal judge has unsealed records that suggest a coverup of an inmate's claims that he was abused by guards after the escape of two prisoners from Clinton Correctional Facility that sparked a massive manhunt in 2015. (nystateofpolitics.com)