LONDON, Sept. 16 (Xinhua) -- Police reopened Parsons Green subway station in west London early Saturday, after an explosion injured 29 people at the station one day ago.
Passengers were seen walking in and out of the subway station on Saturday morning.
British military forces are mobilized to protect important places across Britain after British Prime Minister Theresa May said that an already raised terror threat level at its highest indicates a further attack may be imminent.
"For this period, military personnel will replace police officers on guard duties at certain protected sites that are not accessible to the public," she said.
"The public will see more armed police on the transport network and on our streets, providing extra protection," May said. "This is a proportionate and sensible step which will provide extra reassurance and protection while the investigation progresses."
The Islamic State group has claimed responsibility for the London subway bombing.
British police said Saturday they have arrested an 18-year-old man in Dover in southeast Britain in connection with the rush-hour tube bombing in London.
The blast on Friday morning left at least 29 people injured, and most of them are being treated in hospital for burn injuries.
The blast was caused by an improvised explosive device, which failed to properly detonate, police said.
Previous attacks in London this year at Westminster Bridge, London Bridge and Finsbury Park as well as a blast at an Ariana Grande concert in Manchester killed dozens of people and injured more than 150.
