Grenades, guns and drugs were found after a bomb squad operation forced homes to evacuate.
The bomb disposal team swooped on the Gorse Hill area of Manchester on Friday.
The arrests of four men and a woman on suspicion of firearms offences added to the arrest of three women and a man on Thursday, also on firearms offences and assisting an offender.
In the early hours of Thursday police raided a property on Milton Street and found a suspected firearm and two suspected grenades, MEN reports.
On Friday evening a large police presence remained in the area as specialist officers executed more warrants on Milton Street and Derwent Road.
Two suspected firearms, a number of suspected grenades and a quantity of suspected class A and B drugs have been recovered.
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Armed police and the bomb squad were also pictured on nearby Taylor's Road on Friday.
One resident, who asked not to be named, said she heard "lots of screaming" as police carried out one of the raids just before 2pm on Friday.
She added: "About five minutes later I saw two police officers walking past my house and when I looked, there were armed police absolutely everywhere.
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"They had a guy pinned up against a wall. After about five minutes they started walking with him but then stopped and pinned him against a wall again.
"After about half an hour a police van arrived and they put him in it."
A Stanway Street resident said armed police blocked off both ends of his road and "weren't letting anyone go anywhere".
He added: "At about 3.45pm a policeman knocked on my door and said 'There has been an incident and you're going to have to evacuate, have you got anywhere to go?'"
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Det Chief Insp Joe Harrop, of GMP's Serious Crime Division, said: "There are a number of people in custody being questioned in connection with the discovery of these items and, thankfully, we have safely removed these potentially deadly weapons from our streets.
"We appreciate the disruption, investigations like this can have on communities so I would like to thank members of the public, particularly those whose properties have been evacuated today and yesterday, for their co-operation and understanding.
"Our investigation is ongoing and I would like to offer reassurance that we take incidents of this nature extremely seriously and will continue do all we can to protect people."
On Thursday, three women, aged 41 and 47, and a man, 43, were arrested on suspicion of firearms offences.
All three remained in custody on Friday night for questioning.
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