A US Air Force B-52 Stratofortress bomber crashed shortly after takeoff from Edwards Air Force Base in California on Monday, the Pentagon confirmed. The crash was reported at approximately 11:20 a.m. local time, leaving a towering black plume visible from the base, which is located in the western Mojave Desert approximately 100 miles northeast of Los Angeles.

Edwards Air Force Base closed its airfield following the incident, with all inbound aircraft diverted. Non-commercial visitor passes were suspended until further notice to allow the installation to focus on emergency response operations. Officials had not confirmed how many crew members were aboard the aircraft or whether there were any injuries at the time of publication.

Boeing (BA) manufactured the B-52 Stratofortress, though the aircraft has not been in production since 1962. The bomber first entered service in 1955 and remains one of the Air Force's oldest operational aircraft. The currently flown B-52H variant is a cornerstone of the Air Force's arsenal, with 76 of the aircraft remaining in service. The B-52H typically carries a crew of five and can carry up to 70,000 pounds of bombs and other munitions, including nuclear bombs and nuclear-armed cruise missiles.

Because the airframe is no longer manufactured, any replacement for the lost aircraft would need to be sourced from dismantled airframes stored at the 'Boneyard' at Davis-Monthan Air Force Base in Arizona — a precedent set following a non-fatal 2016 crash that destroyed a B-52H in Guam. The most recent fatal accident involving the aircraft prior to Monday occurred in 2008, when six Air Force personnel were killed after their B-52 crashed into the Pacific Ocean off the coast of Guam while preparing for a parade flyover.

Edwards Air Force Base covers 480 square miles in Kern County and serves as a centre for research, development, and testing of US Air Force aircraft, weapons systems, software, and components; the Air Force and NASA also conduct test flights of new and developmental aircraft at the base. The Air Force recently launched a B-52 upgrade initiative centred on designing new engines, with a total expected price tag of $48.6 billion [Source: CNN]. The investigation into Monday's crash remains ongoing.

Sources: Bloomberg, ABC News, CNN, CBS News, BBC News, NBC Los Angeles