U.K. Police Arrest Teen Near Port After London Subway Attack

LONDON — An 18-year-old man has been arrested in connection with the London attack that injured nearly 30 on a packed subway train, police said on Saturday.

The teen was detained by police near the port of Dover, a key point of entry and exit in the southeast of the country.

Police cautioned that they were still on alert after the Friday rush hour incident, in spite of the “significant” arrest.

“Although we are pleased with the progress made, this investigation continues and the threat level remains at critical,” Neil Basu, the senior national coordinator for counterterrorism policing, said in a statement.

“The public should remain vigilant as our staff, officers and partners continue to work through this complex investigation,” he said. “We are not, at this time, changing our protective security measures and the steps taken to free up extra armed officers remain in place.”

Basu added: “For strong investigative reasons we will not give any more details on the man we arrested at this stage.”

Image: A police forensic officer stands beside a train at Parsons Green subway station Image: A police forensic officer stands beside a train at Parsons Green subway station

A police forensic officer stands beside a train at Parsons Green subway station in London on Friday. Frank Augstein / AP

The detonation at Parsons Green Tube station in southwest London injured 29 people. None of their wounds — mostly superficial burns — were considered serious or life-threatening.

Prime Minister Theresa May subsequently announced that the nation’s threat level for international terrorism had been increased to critical, its highest level, meaning another terror attack may be imminent.

Britain deployed hundreds of soldiers at strategic sites on Saturday to free up police to hunt those behind the incident.