Police say the man has been arrested under Section 41 of the terrorism act, and that he remains in police custody.
Metropolitan Police Assistant Commissioner Mark Rowley told reporters on Friday that police believe the explosion, at about 8:20 a.m. local time, was caused by an improvised explosive device. ISIS claims it was carried out by an affiliated unit.
Emergency services attend the scene Credit REUTERS
May said in a televised statement that armed police and members of the military would be seen on the streets in the coming days.
"This is a proportionate and sensible step which will provide extra reassurance and protection while the investigation progresses", she added. The other was a bombing in May at a pop concert by United State star Ariana Grande in Manchester which killed 22 people, including several children.
Hurricane Irma cuts power to more than 7 million homes and businesses
Utility officials are warning residents that it could take weeks to get the lights back on in parts of the Southeast. Now a tropical depression, Irma is still expected to bring torrential rainfall as far north as North Carolina.
The teen will be brought to a south London police station for more questioning, reports said.
The search had been on for the suspect or suspects involved in leaving a bucket packed with nails and the explosive triacetone triperoxide (TATP) on a busy train during Friday's morning rush hour.
A "fireball" and "wall of flame" ripped through the London Underground service, with commuters and schoolchildren on the District Line at Parsons Green fleeing in terror after a blast shortly after 8am.
Infiltration bid foiled in Machil, 2 militants killed: Army
Sources said the army men deployed along LoC in Machil sector intercepted a group of militants trying to sneak into Valley today. An army statement said the militants were killed in an infiltration bid and two weapons were recovered from them.
Chelsea urged supporters travelling to Stamford Bridge for the match against Arsenal on Sunday to take extra precautions following the attack at Parsons Green, which is near the club's stadium.
Low mortgage rates not impressing potential new home buyers
One of the problems is that once rates reach rock bottom (which is pretty well where they are right now) the only way is up. This could be a good time for more young Americans to take out a Roth Individual Retirement Account or IRA for short.