A 20-year-old man has been arrested on suspicion of murder, along with a 22-year-old man who was arrested on suspicion of conspiracy to murder.
Both have since been released on bail.
Eleven arrests have been made in total so far, leading to three people charged.
However, detectives are still appealing for information.
Anyone with information (including images or footage) should submit it via GMP's dedicated online portal here, or contact GMP via gmp.police.uk or 101 quoting Operation Ravensburgh.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.
