"I want to make it very clear that we are not prepared to tolerate these incidents and we will be taking a strong and robust approach against those suspected of being involved.
"We would like to reassure the local community that this was a targeted attack and that incidents of this nature are still rare. We are not prepared to allow the close work we have developed with the community to be disrupted.
"I want to urge those with information to make contact with us on 0151 777 8676 immediately so that we can bring the offenders to justice and I promise you that we will act on all information given to us in our relentless pursuit of those involved.
"We can't always solve crime on our own - sometimes we need to be pointed in the right direction by local people. If you want to report a crime, but you do not want to be identified to the police, call Crimestoppers.
"Their staff will record your information and pass it on to the police so that it can be used to solve the crime. Your call will not be traced, and you won't have to testify in court or give a full statement, no matter how useful the information turns out to be.
"Crimestoppers want to know what you know not who you are and you can call them at any time on 0800 555 111.
"I would also like to thank the law-abiding people in Norris Green for their continued patience and understanding whilst this police activity is taking place."
More top news
An orangutan at Blackpool Zoo is breathing easily again after successful double surgery carried out by human and animal surgeons.
Definitely some sunny spells around for Thursday & Friday - but a strong and cool westerly wind with scattered, potentially heavy showers
Smartphones, tablets and laptops help young people learn, and keep in touch with family, but they could be a bully's means to cause harm.