Arrest made in London subway blast.

UK  police has made a "significant" arrest in the urgent manhunt for suspects a day after the London subway blast that injured more than two dozen people, authorities said Saturday.

Kent Police has arrested an 18-year-old man in the port of Dover on the English Channel.He is being questioned under the Terrorism Act. Dover is a major ferry port for travel between Britain and France.

The 18-year-old suspect hasn't been charged or identified. Police say he will be brought to a south London police station for more questioning. Police haven't said if he is suspected of planting the bomb or if he played a supporting role in a possible plot.