Armed police swooped on a Dundee multi – just yards away from a primary school.
As many as 30 officers and a fire truck descended on Burnside Court, Lochee shortly after 8.30am on Tuesday.
Officers carrying guns, riot shields and battering rams were called to a property, believed to be on the 13th floor.
Witnesses spotted at least 10 police vehicles at the scene during the incident, which lasted for more than three hours.
Pupils from St Mary’s Primary saw officers carrying riot shields as they made their way into school.
Kathleen Duffy, 80, who has lived in Burnside Court for more than 20 years, said she had never seen such a large police presence.
She said: “I only came out after the police arrived.
“It isn’t unusual to the see police here, but I’ve never seen a presence as big as this.
“I was surprised to see the officers carrying guns.”
Andy Anderson, 20, added: “There were at least 10 police cars when we came past.
“We saw three officers carrying riot shields, other than that we aren’t aware of what exactly was going on.”
Alison Devlin, 33, who has lived in the block for two years, added: “When you see an incident unit van you immediately think the worst.
“The police were guarding the stairwells in the block.
“I am flabbergasted at what I’ve seen this morning. I have never seen anything like this before.”
Another resident, who declined to be named, said they saw a police officer removing a knife from the scene in an evidence bag.
She said: “It certainly didn’t look like your usual drug bust.
“We saw dozens of officers coming out of unmarked vans. There were at least 30 police officers at the scene.
“We saw a knife getting taken away in an evidence bag.
“It amazes me they are even contemplating taking away the concierge service given what we have seen today.”
Another witness said: “Some of the schoolkids saw the officers entering the building with the riot shields.
“They were just making their way into school. It must have been terrifying at that age to see that.”
Police officers were seen leaving the scene around midday today with one male being taken away in a police van as a number of bystanders looked on.
A Police Scotland spokesman said: “The incident at Burnside Court in Dundee has now concluded.
“A 24-year-old man is now safe with police. The incident was contained, and there was no risk to the public at any time.
“Thank you to residents for their patience and understanding.”