Local police said on Friday they suspected the man was part of a four-person gang who allegedly planned to carry out the robbery this weekend, when the Italian capital would be relatively quiet due to the Ferragosto public holiday .
The Carabinieri Police Press Office told CNN that officers arrived at the collapsed tunnel on Thursday, after receiving reports that a man was trapped under the rubble.
Shortly after their arrival, they arrested two people suspected of having tried to flee the area by car and, separately, a fourth man.
Rescuers spent eight hours freeing the trapped man, who remains under medical observation at San Camillo Hospital in Rome.
Attorney Carmine Pascarosa, who represents the two men arrested in the car, told CNN the pair were charged with resisting arrest and are not currently being investigated for other crimes.
He said both men denied any involvement with the man rescued from the rubble. According to Pascarosa, the two men said they were passing through the area “by chance” when a man called for their help and took them to a vacant store that housed the entrance to the tunnel.
Once they realized what had happened, they called rescuers before leaving the scene, he added.
Pascarosa confirmed that a fourth person is being investigated and charged alongside the injured man in connection with the tunnel collapse.