A man, aged in his 50s, was arrested on Saturday, 13 July on suspicion of attempted murder and firearms offences; he remains in custody.
Police were called to Malvern Drive, Woodford Green at 11.30pm on Thursday, 11 July, following reports of a shooting.
Officers, including armed police, attended and found a 41-year-old man suffering from gunshot injuries. The injured man was taken to hospital where his condition remains critical.
Detectives from Trident and Area Command investigate and retain an open mind as to motive.
No arrests have been made. Enquires continue.
Detective Chief Inspector Nicky Arrowsmith of Trident said: “This investigation remains ongoing and officers continue to follow a number of lines of enquiry.
“We are still appealing for any witnesses or anyone who has information to come forward and speak to police.
“The shooting took place at a residential property in Malvern Drive. Were you in Malvern Drive around that time? Did you see anything unusual or possibly the suspect fleeing the scene?”
Anyone who saw this incident or has cctv/dashcam footage is asked to call Trident on 101 quoting 9891/11JUL or contact Crimestoppers anonymously on 0800 555 111.