British police sent a bomb disposal team to a house in northern England Tuesday after officers carried out pre-dawn raids to arrest four men on suspicion of plotting terrorist attacks.
The men, aged between 22 and 41, were arrested at their homes in Sheffield and Chesterfield, Derbyshire.
Neighbours of the Chesterfield property and local shopkeepers were evacuated to the nearby Proact Stadium football ground and the area was cordoned off.
Three properties in Sheffield and one in Chesterfield are now being searched in connection with these arrests.
An "enormous bang" was heard as officers swooped into the property, according to one neighbor.
The 31-year-old was arrested at his home address on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism.
Planning for the alleged plot was believed to be at an advanced stage and connected to a Christmas target, a Yorkshire Police spokesman told ABC News today. We would like to reassurance them that this was part of the method of entry to gain access.
Carol Perry, who lives two doors from the scene, said: "I was asleep and then I was woken suddenly. and the house shook. I pulled the curtains and saw lots of armed men in the street, so I kept watching because that was quite extraordinary".
"We recognise that local people may have concerns as a result of this activity".
A spokeswoman from Counter Terrorism Policing North East said the noise "was not an explosion". We would ask people to remain alert but not alarmed and we are grateful for the assistance and understanding of people locally.
Addressing the public, Derbyshire Constabulary assistant chief Constable Bill McWilliam said: "Please be reassured; the arrest we wanted to make has been made. Public safety is our utmost concern".
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