A friend of David Sonboly has been arrested on suspicion of helping him plan the attack

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German police have arrested the 16 year old Afghani boy as they suspect he knew Ali David Sonboly was planning the fatal attack and did not report it.

Munich Police said the arrested youth may have played a role in taking over a girl's Facebook page and inviting youngsters to McDonald's - where the shooting happened - for free food.

They arrested the teen at 6.15pm local time (5.15pm BST) in the Laim district of Munich.

He had originally come forward of his own accord on Friday following the shooting which left nine dead.

Police said he was questioned over his relationship with the gunman who had been planning the attack for a year, allegedly to get back at those who had bullied him.

However, since then police found contradictions within his statement.

A Munich Police statement, said: It is suspected the 16 year old is a possible accomplice.

"The Munich Criminal Service has therefore arrested the youth on suspicion of failing to report a scheduled offence under Article 138 of the Criminal Code.

"The extent to which the arrested person is responsible for a Facebook call for a meeting in a cinema complex near the Munich main train station, the other criminal investigations are looking into."

More to follow...