Counter terrorism police are now leading the investigation into the death of former Conservative minister Ann Widdecombe, after "new information and evidence has come to light", Counter Terrorism Policing South East (CTPSE) has said.
"The police are pursuing multiple lines of enquiry to establish the motivation for this attack. I will be updating the House further this afternoon," Home Secretary Shabana Mahmood said.
A 28-year-old white British man from Rotherham, South Yorkshire, was originally arrested on suspicion of murder on Saturday but has now been re-arrested "on suspicion of commission, preparation or instigation of acts of terrorism", CTPSE said.
Police said the "dynamic and complex investigation" had led to the new arrest.
On Thursday, 78-year-old Widdecombe was found dead at her home in Haytor, Devon, having sustained serious injuries.
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