Four people have been arrested in a Syria-related counter-terrorism investigation.
Two Sheffield men, aged 40 and 36, are being questioned at a police station in West Yorkshire.
In addition, a 55-year-old woman and a 44-year-old man from Batley were arrested over suspected terrorist fundraising.
In a separate development, a 23-year-old man has been arrested under the Terrorism Act in east London.
Five properties in Sheffield, Batley and Dewsbury are also being searched.
The North East Counter Terrorism Unit said the investigation over the Yorkshire arrests was Syria related.
The two men from Sheffield have been arrested on suspicion of an offence under Section 5 of the Terrorism Act - preparation to commit an act of terrorism.
'No evidence of risk'
The other two have been arrested on suspicion of terrorist fundraising.
Det Ch Sup Clive Wain, head of the North East Counter Terrorism Unit, said: "We understand that people may be concerned following today's arrests however we would like to reassure communities that today's activity is as a result of an ongoing investigation which is intelligence led.
"There is no evidence to suggest that communities are at risk."
In an unrelated operation, the Metropolitan Police's Counter Terrorism Command arrested a 23-year-old man on suspicion of the commission, preparation or instigation of terrorism in east London.
Officers have been searching the address where he was detained and a second residential address nearby.
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