18-year-old youth held for London Tube terror attack

London: An 18-year-old man was arrested on Saturday in connection with the terror attack on a packed London Tube train, the Metropolitan Police said, calling it a "significant" development in the ongoing investigation. The man was arrested by Kent Police in the port area of Dover in the morning under the UK's Terrorism Act. He was taken into custody at a local police station and then transferred to a south London police station.

Hours later, counter-terrorism specialist firearms officers began evacuating buildings to search at a particular residential address in Sunbury, Surrey, south-east England. They said that the evacuation was a "precautionary measure" following the first arrest in the investigation into the bombing of the underground train a day earlier.

"We have made a significant arrest in our investigation this morning. Although we are pleased with the progress made, this investigation continues and the threat level remains at critical," said Metropolitan Police Deputy Assistant Commissioner Neil Basu.

At least 30 people were injured during the attack in which an improvised explosive device (IED) was detonated on a Tube train at Parsons Green underground station during the morning rush hour on Friday. Basu, also the UK's Senior National Co-ordinator for Counter Terrorism Policing, seemed to indicate that the force was still on the hunt for further suspects.