British police say they have arrested a man in connection with Thursday's bombings in the city's transit system.
A police spokeswoman says the arrest took place in Stockwell, where police shot and killed a man at a train station earlier Friday.
Police say the fatal shooting at the station was directly linked to the ongoing terrorist investigation in the city.
Police did not say whether the arrest was linked to their earlier release of surveillance photos of four suspects wanted in connection with Thursday's explosions. Three showed suspects at train stations and the fourth of a suspect on a bus.
Authorities say Thursday's bombs used homemade explosives that did not fully detonate and caused no serious injuries.
The blasts were claimed by the same group - Abu Hafs al-Masri Brigades - that took responsibility for the similar July 7 London transit bombings that killed 56 people.