Mrs May will be jointly hosting a summit with French president Emmanuel Macron next week in New York and the warning to technology giants over extremists is expected to be high on the agenda.
The terror level has been raised to its highest level to ‘critical’ by the Prime Minister, suggesting a further attack is imminent.
They are said to have a CCTV image of the suspect on the phone along with fingerprints on the alleged nail device.
The bomber dumped the bomb into a large builder’s style tub inside a Lidl bag, which partly ignited at 8.20am yesterday morning.
Prime Minister Theresa May will be holding a summit with French President Emmanuel Macron
Many said there was a fireball sent through the carriage leading them to fear for their lives and stampede off the train.
Security chiefs have been working hard to trace the calls made from the Parsons Green area as it emerged today an 18-year-old has been arrested at Dover port in connection with the incident.
It is understood the bomber was on a watch list as US President Donald Trump said in a tweet Scotland Yard was aware of the attacker, which sparked a row with British police.
Terror experts believe the real target could have been either Paddington or Earl’s Court as the packed commuter train was destined for Edgware Road.
Internet giants including Google, Facebook and Microsoft have come under fire
ISIS has claimed the terror cell was behind the Tube train attack.
Rita Katz, director of US intelligence group Site, said ISIS claimed the bombing was the work of a “detachment” rather than simply a “soldier” which she said underlined it could have been a coordinated attack.
“Earl’s Court, Notting Hill and Paddington, these are internationally recognised destinations on that line that would have had much greater impact.”
“There are a lot of similarities with the aftermath of the second largely failed explosions on the London underground in 2005,” he said.
“In appearance and arrangement the remnants of the device seem highly similar to those of the hydrogen peroxide based devices of 2005.
“The flash flame reported suggests that the explosion was only partly successful. In particular much of the bucket still seems to be intact and there appear to be no victims with lethal impact wounds.
The ‘how to’ guides were easily available online although calls have been made to pull the information off the websites, including the partially triggered crude device in London.
Conservative MP Jacob Rees-Mogg said he believed Google should be held criminally liable.
“I would like to see the company made criminally liable for the result of any terrorist act that it can be shown to have abetted.
Simon Kempton, counter-terrorism lead for the Police Federation of England and Wales, said: “The responsibility is on the internet providers, the hosts, to take down this material if it is clearly a threat to public safety.
“This type of thing should not be searchable.
But a Google spokesman said it was doing all it could to tackle the issue and added: “We remove links to illegal content from our search results as soon as we’re notified of them.
“We are committed to working in partnership with governments to tackle these challenging and complex problems.”