A device which exploded in a common close in Dundee had the potential to put lives at risk, police said.
Officers were called to the building in Dundee’s Cullen Place shortly before 10pm on Thursday.
The tenement had to be evacuated after the incident and damage was caused to surrounding properties.
Tayside Police confirmed on Friday that no one had been injured but that the incident had the potential to put lives at risk.
Officers are following up on reports that there have been fireworks-related incidents in the surrounding areas in recent weeks.
It has not yet been confirmed what the device was.
Items of forensic interest have been recovered from the common close where the device went off and an initial assessment by officers from explosive ordnance disposal, who travelled through from Edinburgh on Friday morning, confirmed there was a lack of sophistication to the device, but it had the potential to cause harm.
Tayside Police inspector David McIntosh said: "The device appears to be fairly crude and uncomplicated, but irrespective of whether this was intended to be high jinks or something more sinister, there was the very real potential for it to cause significant damage and put lives at risk.
"In the event, and mainly because of the confined nature of the common close, the explosion damaged doors in the block blowing them open.
"We have received reports in recent weeks of fireworks-related incidents and loud bangs being heard in the Douglas area. Clearly, there is tremendous risk in playing with any type of explosive, including fireworks, and we would urge residents to report any incidents they are aware of or information that they have.
"We will have an increased uniform presence in the area in the coming days and I would encourage residents to approach officers and speak with them. If you have any information that could help, tell us now before someone injures themselves or others."
The inspector said officers have also been made aware of a resident in the same area hearing a similar explosion at about 9pm also on Thursday. On looking out into a common garden area in Cullen Place they saw smoke coming from a patch of weeds. No one was injured in this incident.
Inspector McIntosh added: "It is likely that the answers to this incident lie within the local community and I would urge people not to stay quiet out of some misguided loyalty. If you know someone who is playing around with fireworks, who has fireworks at home, or who has recently bought fireworks for no obvious occasion or without good reason, then get in touch with us.
"We are relieved that no one has been injured but the potential dangers should be apparent to everyone."
He added that inquiries at the scene were continuing with officers speaking to residents in the area.
Anyone with information should call Tayside Police on 0300 111 2222 or speak to any officer. Alternatively they can pass information anonymously via the charity Crimestoppers on 0800 555 111.
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