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The video, obtained by ITV News, shows a figure carrying a Lidl bag similar to the one containing the explosive device used in the Parsons Green terror attack. The suspect is seen wearing a blue or pale coloured long sleeved top and trousers, with dark shoes and a red hood or hat. And in their left hand, the person is carrying what appears to be a full Lidl shopping bag as they left a property on the morning of the bombing. The mysterious figure was seen leaving a Surrey residential address, which has since been raided, at around 6.50am on Friday morning, ITV reports.

ITV NEWS The mysterious figure was seen leaving a Surrey residential address

And less than two hours later, a crude device partially detonated on the London Underground’s District Line at Parsons Green tube station, injuring almost 30 people. Images posted on social media following the incident, which police are treating as a terrorist attack, appeared to show wires protruding from a flaming bucket inside a plastic Lidl carrier bag on the floor of a carriage. Cops swooped on the property in Sunbury-on-Thames yesterday after a teenager was arrested in Dover in connection with the attack. The home belongs to Ron and Penny Jones who received an MBE in 2009 for fostering hundreds of kids. Dave Solway, who lives opposite Mr and Mrs Jones, said he saw the property being "swarmed" by police during Saturday's raid

TWITTER At least 29 people were injured in the explosion, but there were no fatalities

TWITTER The crude device partially detonated on the London Underground’s District Line

The 44-year-old said: "Counter-terror police began banging on their front door with shields, bomb-proof shields. "I saw Penny being pulled out basically, I didn't see Ron, don't know if he was there. "There was loads of them, it was swarmed, there must have been a good 15-20 easily round the back, front, side of the house." Mr and Mrs Jones, who have been foster parents for almost 40 years, had taken in up to 300 children including eight refugees. On Sunday, Scotland Yard also arrested a second man in south-west London in connection with the investigation.

Parsons Green terror attack, pictures from the scene Fri, September 15, 2017 Shocking pictures after many people have been injured after an explosion on Tube train at Parsons Green, London Play slideshow Twitter/gacv80 1 of 52 Victim of the Parsons Green explosion

The 21-year-old man was arrested in Hounslow shortly before midnight, and police are searching a residential address in Stanwell, Surrey, in conjunction with his arrest. Both suspects are being held under section 41 of the Terrorism Act 2000. This law gives police the power to arrest someone suspected of terror-related offences without a warrant. It also allows police to detain suspects without charge beyond the four days allowed for suspects connected to other crimes. The maximum period of pre-charge detention has varied but currently stands at a maximum of 14 days.

PA Scotland Yard have arrested two men