>> Police have arrested a second man over Friday's bombing attack on a London train, detaining a 21-year-old under Britain's Terrorism Act in the West London suburb of Hounslow just before midnight, Saturday. They also raided a house in the town of Sunbury about four miles away. The homemade bomb shot flames through a train carriage packed with morning commuters at Parson's Green Tube station, also in the west of the capital.
It injured 30 people but the device failed to fully detonate. Earlier on Saturday, police arrested an 18-year-old man in Dover's port area, where passenger ferries set sail for France. Islamic State claimed responsibility for the Tube bomb as it has for two other attacks in London this year and one at a concert in Manchester by US singer Ariana Grande.
But intelligence officials say there is scant evidence so far of the group's involvement. Images from the scene show a plastic bucket in flames with wires sticking out of it. After Friday's bombing, Britain raised its threat level to critical, meaning another attack may be imminent, British troops guarding strategic sites to free up hundreds of police officers for the manhunt.
They're scouring through surveillance footage, examining the device and speaking to witnesses as they try to establish whether or not the bomber worked alone.