Police have been given another six days to question a man a rrested after a suspicious item was discovered at a London Tube station.
The 19-year-old was arrested on Friday, a day after a suspect package was found at North Greenwich station close to the O2 complex in south-east London, sparking a security scare.
A controlled detonation was carried out on the item, which was reported to have been handed to a Tube driver and possibly contained wires and a clock.
British Transport Police were called to the station shortly after 11am on Thursday after train staff reported finding a "suspicious item" on a train travelling eastbound on the Jubilee Line.
Officers evacuated the station and it remained shut for several hours as specialist teams worked to make the item safe.
Westminster Magistrates' Court granted a warrant for the suspect to be detained until Friday.
In a statement, the Met said: " Officers continue to encourage the public to remain vigilant and alert at all times, and report anything suspicious to police.
"The public will see more officers, including armed police, in and around transport hubs to provide reassurance around public safety."
On Saturday a device was discovered at an address in Devon by police investigating the North Greenwich tube incident.
The local area in Tudor Road, Newton Abbot, was evacuated for a time but the item was later declared not viable.
The current threat level for international terrorism in the UK is severe - meaning an attack is "highly likely".