Two men have been arrested in connection with the seemingly motiveless double murder of a young couple who were gunned down in their Upper Norwood home.

Jordan Lee Jackson, 20, and Leyla Djemal-Northcott, 21, were shot dead in their Menlo Gardens flat by two masked gunmen last Tuesday morning.

The suspects, one aged 19 and the other 21 were arrested on Sunday. They appeared in court yesterday morning (Tuesday) where police were granted more time to question them.

They were held in separate south London police stations and later bailed to return in a month's time.

Leyla, who worked at the Westow Hill Post Office in Upper Norwood, was shot once in the head as she lay in bed while Jordan, a removal man, was shot once in the neck in the hallway.

His twin brother Kieran was shot in the head and hands and remains in a stable condition in a south London hospital.

Detective Chief Inspector Peter Valentine - leading the case for Operation Trident - said it is understood that Kieran may have tried to protect his twin brother by stepping in front of him and putting out his hands.

"He is probably going to be maimed for life," he said.

Keiran's girlfriend - who was also in the flat at the time of the attack - was uninjured.

Police say they are genuinely baffled by the case and that no motive has been established for the murder of the young couple, who had been dating for almost five years and decided to move in together last Christmas.

Leyla's mum, who does not wish to be named, said this week: "The way I feel is indescribable. There are no words to say how I feel.

"Leyla was a sweet girl who was so happy and had such a lovely life. She was just starting out on her adult life with Jordan and they had everything to live for and were making plans. She was a very popular child. She had lots of friends, they were both very popular.

"I can't think of any reason why this would happen. This is absolutely senseless. They were just young people getting on with their lives and living a healthy existence and enjoying life."

Twins Jordan and Kieran, former pupils of Selhurst High School for Boys, would have celebrated their 21st birthdays together next month.

Their uncle Leroy Jackson, an anti-gun campaigner who set up Save Our Souls (SOS) in 2003 - a Norwood based youth group which warns youngsters of the perils of guns and drugs - said: "I believe like most of the community, everyone is baffled right now as to why this has taken place. Jordan, Kieran, Leyla, they are not involved in negative activity.

"Since Jordan left school and Kieran they have been working. They are honest respectable people of the community and I still can't find a reason for why this has taken place."

The inquest into the deaths of Jordan and Leyla was opened yesterday and adjourned indefinately. Asked by coroner Dr Roy Palmer if the reason for the killings could be linked to drugs or a domestic matter, Det Chief Insp Valentine said there was no known motive at this stage of the investigation.

Anyone with information should call the incident room on 0208 247 4553 or Crimestoppers anonymously on 0800 555 111.