Two people who were arrested on suspicion of the murder of teenager Alan Cartwright have been released on bail.
The pair, both male and aged 17 and 21, were arrested on Wednesday in relation to the death of the teenager, who was stabbed to death while riding a bicycle with friends.
Both have been bailed to return to a London police station in April.
Two other suspects, both aged 18, are still in custody, the Metropolitan Police said.
Harrison Ford's son has tweeted from hospital to say that his father is "battered, but OK" after a plane crash in California.
Chef Ben Ford also thanked people for their support after the Star Wars and Indiana Jones actor was hospitalised.
Harrison Ford is now being described as suffering "fair to moderate" injury following his plane crash in Los Angeles, the city's fire department says.
Papiss Cisse has accepted a charge from the Football Association for spitting at Manchester United's Jonny Evans, Newcastle United said.
The 29-year-old Senegalese striker could face a ban of up to seven games after the incident during Wednesday's game against Manchester United.
Defender Evans, also charged by the FA, has yet to respond.
The pilot of a plane crash in Los Angeles - believed to be Harrison Ford - was "alert and conscious" and in "moderate condition" when treated by emergency services, the Los Angeles Fire Department has said.
A spokesman for the fire services says the patient was fortunate not to have died or suffered more serious injuries in the crash.
A plane crash at a California golf course was caused by a "mechanical failure", Los Angeles Police Department says
LAPD spokeswoman Officer Nuria Vanegas said: "We can confirm that there was a plane crash and the male occupant was a 65-70 years old man.
"He was transported to a local hospital in stable condition,"
A man - believed to be actor Harrison Ford - injured in a plane crash at a California golf course is in a critical condition, local authorities say.
The Los Angeles Fire Department tweeted that the adult male involved in the crush had been transported to a nearby hospital.
Actor Harrison Ford has been seriously injured after a small plane he was piloting crashed on a California golf course, NBC News reports.
Ford was reportedly stabilised and taken to a local hospital after the crash, with sources telling the broadcaster he sustained cuts to his head.
Howard Tabe, an employee at the golf course in Mar Visa, said: 'There was blood all over his face ... Two very fine doctors were treating him, taking good care of him. I helped put a blanket under his hip."
Ford is believed to have been flying solo, and crashed shortly after takeoff from Santa Monica Airport, according to the report.