London police have arrested conservative activist Tommy Robinson on terrorism charges. He was taken into custody on Friday for allegedly refusing to turn over his phone to UK authorities. Robinson, 41, whose real name is Stephen Yaxley-Lennon, will now miss his own planned rally on Saturday as he will remain in custody, the Telegraph reported.

Robinson was charged under schedule seven of the Terrorism Act 2000, police said. The activist was detained by police in July upon entering the country at the Channel Tunnel in Folkestone following his "patriotic rally" in London. Robinson was arrested and remanded to jail when he arrived at the station for a pre-planned arraignment.

Under the Terrorism Act 2000, authorities are allowed to stop anyone passing through a port "to determine whether they may be involved or concerned in the commission, preparation or instigation of acts of terrorism."

Police can detain the individual for six hours, and the detained person must legally answer questions and provide authorities with the password or PIN for their electronic devices. If the individual refuses to comply with the demands, they can be jailed for having committed a criminal offense.

Robinson told a supporter who had gathered outside the Folkestone police station on Friday, "I'll see what happens, mate. I don't expect to come back out there," as per the paper. Robinson is set to appear at Westminster magistrates' court on Nov. 13.