Shots were fired at four separate houses in south Manchester this week in targeted attacks now being linked by detectives, police said tonight.
The latest shooting happened at 1am on Thursday morning, when a shotgun was fired at the front door of a property in Chorlton.
No one was injured in any of the four incidents.
But detectives said shots were 'clearly directed at particular houses'.
"We do not believe that these are random attacks," said Detective Inspector John Robb.
The shootings happened in Burnage, Fallowfield and Chorlton between Monday evening and the early hours of today, Thursday.
Police have issued an appeal for witnesses as enquiries continue.
No arrests have been made as yet.
Greater Manchester Police also want to hear from anyone with information about a white Audi TT which was spotted nearby two of the locations involved at around the same times as the shootings.
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"Between Monday - September 28 - and today - October 1 - officers have been called to reports of shots fired at four separate addresses across the city," said GMP in a statement.
"Having reviewed several lines of enquiry, detectives are now treating the incidents as linked.
"No one was injured in any of the incidents."
Police were called to Moorton Avenue, Burnage, on Monday to reports a shot had been fired at a house at 11pm.
Officers found a shot had been fired through a window.
Then on Tuesday, at around 10.15pm, police received reports of shots being fired at a house on Clinton Avenue, Fallowfield.
"Officers attended and found evidence of a firearms discharge," said a force spokesman in the statement.
"At both of these incidents, it is believed a white Audi TT was nearby at the time and anyone who may have seen the vehicle is asked to get in touch with police."
On Wednesday, officers were called to a report of shots being fired on Shawlea Avenue, Burnage, at around 11pm.
A man is believed to have walked up to a house and fired a shot before running off.
In the latest incident at 1am this morning, officers were called to a report of shots being fired at an address on Mersey Bank Avenue, Chorlton.
A shotgun was fired at the front door of a property.
Detective Inspector Robb added: "Thankfully in all of these incidents, no one was injured and the discharges were clearly directed at particular houses.
"We do not believe that these are random attacks and we don't believe there is a threat to the wider community.
"Residents may notice an increased police presence in the area whilst our investigation continues and anyone with concerns can speak to one of our officers.
"These are very serious incidents and we appreciate that the community will be concerned.
"Experienced detectives are following all lines of enquiry to find those responsible but we need the public to come forward with any information that will assist with our investigation.
"Even the smallest piece of information could prove vital for completing our enquiries."
Call police on 0161 856 6063, quoting incident number 3122 of 30/09/2020, orCrimestoppers on 0800 555 111.