They have all been released on police bail.
A vehicle which is believed to have been used in the incident has been recovered.
Detective Chief Inspector Richard McCutcheon of Lancashire Police said: “Our enquiries into the incident remain ongoing. If you saw or heard anything suspicious around the time or have any information which could assist our investigation, please let us know.
“I would like to remind the community that this incident was not directed at the general public and appears to be a targeted attack.”
Anyone with information should contact police on 101 quoting log 0070 of October 23rd or independent charity Crimestoppers on 0800 555 111.