http://news.bbc.co.uk/1/hi/uk/4720027.stm Police believe one of four men arrested in Birmingham by anti-terrorism officers could be a suspect in the failed 21 July attacks on London. Sources said Yasin Hassan Omar, 24, suspected of being responsible for an attempted attack near Warren Street Tube station, was arrested. The man was held after being shot with a Taser stun gun. The BBC has learnt he was wearing a rucksack at the time. He is believed to be at London's Paddington Green police station. In other developments on Wednesday: Police searched two properties in Enfield and Finchley, north London. Two people were also held in Grantham, Lincolnshire, on a train travelling to King's Cross, under the Terrorism Act 2000 at 2300 BST on Tuesday following information from two off-duty Met police officers. A man who was detained under the Terrorism Act at Luton Airport has been allowed to continue his journey to Nimes in France. Police said they had responded to reports the man looked like one of the bombing suspects and he was held while his identity was checked. The body of innocent Jean Charles de Menezes, 27, who was shot by officers at Stockwell Tube, is to be returned to Brazil for a funeral. And in Birmingham, shortly after the first man was arrested early on Wednesday morning, a further three men were arrested at a separate Birmingham address and were being held in the city. The first man was arrested in Heybarnes Road, in the Small Heath area of Birmingham, at 0430 BST on Wednesday, and later taken to London. A suspect device found with him is being examined and a controlled explosion is planned. His detention followed a joint operation between West Midlands Police and officers from the Metropolitan Police Anti-Terrorist Branch. The BBC's home affairs correspondent Daniel Sandford said if the man was one of the four suspected bombers, a key question would be whether he would co-operate with police. Police will want to know where the other three men are, who was the mastermind behind the 21 July bombings, and - if they are linked to the 7 July bombings - who the mastermind was behind the first attack, our correspondent said. In exchange for such information, a suspect could expect a "discount" on any possible sentence, he said. Railway station Although the suspect was shot with a stun gun, police say no firearms were used. Following Army advice on the suspect package, residents of about 100 neighbouring homes were evacuated. A second address in Bankdale Road, in Ward End, Birmingham, was raided a little later, and three men were arrested under the Terrorism Act 2000. Forensic tests are taking place at both addresses in Birmingham. 'Flat out' Meanwhile, a flat in north London linked to two of the 21 July suspects is being searched, and police say chemicals found there and in a garage may have been intended for use in explosives. A resident living near the flat said she had seen one of the suspects outside her home on the day after the failed bombings. The Metropolitan Police chief Sir Ian Blair said those behind last week's attempted bombings could carry out another attack. "They are capable of killing again," he told Channel Four News. "We must find them. We are flat out and we are getting a great deal of intelligence." Police have linked Yasin Hassan Omar, 24, and Muktar Said Ibrahim, 27 - also known as Muktar Mohammed Said - to the flat in the 12-storey Curtis House, in Ladderswood Way, New Southgate. A white VW Golf, seized in nearby East Finchley on Tuesday, may have been used by one of the suspects, security sources said. Before Wednesday morning's arrests, five people had been held under anti-terror laws in connection with the inquiry. None of them is thought to have been among the failed bombers.
