A grieving father has paid a moving tribute to the son stabbed to death at the weekend.

In an emotional tribute, Colin Knox described his 18-year-old son Rob as "an angel without wings".

And he urged those who carry knives to consider the consequences.

It comes as Police Minister Tony McNulty wants police to step up stop and search powers.

London Mayor Boris Johnson is promising to tackle knife culture in the capital.

The father of the latest stab victim said he spoke to his son about the dangers of knives hours before his death.

Colin Knox from Sidcup is urging anyone who carries a knife to consider the possible consequences.

He described his son Robert as an "angel without wings" who was happy, outgoing and fun to be with.

The 18-year-old was knifed in Sidcup in the early hours of Saturday morning.

Police Minister Tony McNulty wants stop and search powers stepped up following the death of Rob Knox.

The 18-year-old Harry Potter actor was stabbed in Sidcup at the weekend.

Mr McNulty's criticised comments by the Children's Commissioner Sir Al Aynsley Green - who said new powers to deal with knife crime could cause hostility.

He insists stop and search is vital.

Police will today continue questioning a 21-year-old man arrested over the fatal stabbing.