Ten people - the youngest just 16 - are facing charges over a violent home invasion and the armed kidnapping of a Sydney man.
The 37-year-old victim was forced into a car by a group of men who burst into his home at Bringelly in Sydney's southwest in the early hours of Tuesday. One was armed with a gun.
Investigations led police to an industrial factory in Revesby, where they say the man was held hostage for six hours.
Officers surrounded the building and negotiated the man's release.
The building was set alight after he was freed.
Tactical police grabbed eight men at the site, then arrested a further three when they showed up in cars during the operation.
Seven males - two 23-year-olds and the others aged 16, 19, 22, 26 and 27 - have been charged with kidnapping with intent to ransom resulting in actual bodily harm, break and enter, tampering with evidence, and participating in a gang.
They've all been refused bail and will appear at courts in Bankstown and Parramatta on Wednesday.
Another three men - aged 27, 28 and 30 - are facing kidnapping and gang-related charges. They've also been refused bail and will appear at Parramatta Local Court.
Another man is in hospital under police guard. Police say they're expecting to charge him on Wednesday.
The 37-year-old kidnapping victim suffered non-life-threatening injuries to his head and face.
An older man assaulted in the home invasion has minor injuries.
Detective Superintendent Andrew Koutsoufis told reporters on Tuesday the abducted man was lucky to be alive.
"The incident was exceptionally dangerous and could have been even more severe, or even fatal," he said.
"The level of violence towards the alleged victim was quite severe."
Inquiries are continuing, but police believe the incident is related to organised bikie crime.