authorities are scrambling tonight to learn more about the 22-year-old suspect and whether he had help. >> oh, my god. >> reporter: tonight a u.s. counterterrorism official tells cnn the bombing outside the manchester arena looks like an isis attack but says u.s. intelligence officials are working with their british counterparts to learn more. isis has claimed responsibility but a british counterterrorism official says so far authorities there have discovered no evidence of a link between suspected attacker salman abedi and an established terror group. british police tonight are working furiously to see if there's a connection. >> our priority along with the police counterterrorist network and our security partners is to continue to establish whether he was acting alone or working as part of a wider network. today police blew in a door and raided a house associated with the suspect and forensics teams were spotted as well.