Armed police tackled a man to the ground in Wigan as detectives made their fifth arrest in connection with the Manchester bombing.
Witnesses say the man was detained in Upper Dicconson Street after he was seen with a suspicious package.
The town centre was in lockdown as officers carrying automatic weapons carried out the raid.
Photos shared on social media appeared to show him being led away by plain clothes officers with their faces covered wearing black police caps.
Greater Manchester Police said: "We have made an arrest in Wigan this afternoon in connection with the investigation into the horrific incident at Manchester Arena.
"The man was carrying a package which we are currently assessing, a police cordon remains in place while this is carried out."