Four teenagers are recovering in hospital after being shot in the same incident in Merseyside late last night.
Three 17-year-olds and a 15-year-old were injured in the shooting, which happened in Akenside Street, Bootle, at about 11.30pm.
Police say it is possible the attack may have been targeted.
Police said emergency services were called to Akenside Street after reports that a 17-year-old youth had been shot.
A short time later a 15-year-old youth and two 17-year-old youths sought medical attention for shot gun injuries believed to have happened in the same incident.
Their injuries are not thought to be life threatening.
A cordon has been put in place at the scene of the shooting and police are making door to door enquires and trawling CCTV footage from the area.
An extensive search of the area has been carried out and neighbourhood patrols have also been stepped up, said police.
Chief Superintendent Julie Cooke, of Merseyside Police said: "This is a disgraceful act that has led to four young men receiving medical treatment for shotgun injuries.
"Although their injuries are not thought to be life threatening the consequences could have been much worse.
"We are currently keeping an open mind as to whether this attack was targeted.
"The force, along with the community, will not tolerate the use of guns and the fear those who use them spread.
"I urge anyone who has any information that can help in our investigation to come forward."
Anyone with any information is asked to contact Matrix on 0151 775 699 or call Crimestoppers on 0800 555 111.