Authorities tell ABC News that they found a kind of bomb-making workshop in Salman Abedi’s home and he had apparently stockpiled enough chemicals to make additional bombs.
The hunt is intensifying for what British authorities suspect is a possible “network” behind the deadly suicide blast outside an Ariana Grande concert at Manchester Arena on Monday, officials say.
The search stretched from the U.K. to Libya, where officials made multiple arrests in a country seen by American officials as a burgeoning new base of operations for ISIS, which has claimed Salman Abedi was a “soldier of the Caliphate.”
Counterterrorism officials fear whoever built the bomb that killed 22 people and injured more than 50 others may have built other improvised-explosive devices which could be used in further attacks.
“I think it’s very clear that this is a network that we are investigating,” Ian Hopkins, chief constable of the Greater Manchester Police, said in a press briefing.
According to a terrorism expert who has been briefed on the investigation, the bomb featured a sophisticated design similar to the bombs used in the attacks in Brussels in 2016.
The expert confirmed that Abedi traveled to Manchester Arena by train, likely carrying the bomb in a backpack. The device, a metal container stuffed with bolts and nails, was apparently hooked to a powerful battery and featured a remote, cell-phone detonator with built-in redundancies to ensure a blast even if a first attempt failed.
The design was sophisticated enough to bolster the theory that Abedi didn’t act alone, suggesting, according to the expert, “there’s a bomb maker on the loose.”
“It’s really suggesting that he probably did not act alone, that he probably had some help, that he certainly had some advice on how to create the bomb,” said Matt Olsen, former director of the U.S. National Counterterrorism Center and an ABC News contributor.