The head of the Metropolitan Police has revealed his force is assessing threats which sparked a major security alert in the West Midlands to determine whether officers from other forces might be in danger.
Police Commissioner Sir Bernard Hogan-Howe said further guidance had not been given to Met officers at this stage, but confirmed he had spoken to the West Midlands Police chief constable to find out what the state of the threat was.
Once we've assessed it, we'll decide whether or not to give any further advice.
It comes after an anonymous tip-off reportedly exposed a plot to kidnap and kill a serving police officer in Birmingham.
Timeline: Security alert over threat to 'kidnap police officer'Read the full story ›
Threats to kidnap and kill a serving police officer in Birmingham were behind a major security alert in the West Midlands overnight, according to reports.
Additional security measures have now been implemented at the force, including issuing advice to officers about travelling to and from work in partial uniform, and security at police stations in the region.
West Midlands Police has implemented additional security measures after receiving anonymous information yesterday.
The force said the information, which is related to the safety of the police officers and staff, is currently being assessed. The national security threat remains at severe meaning a terrorist attack is highly likely.
West Midlands Police treat all information relating to matters of security extremely seriously.
In this particular case we have received information relating to the safety of West Midlands Police officers and police staff. There is nothing at this time to suggest there is an increased risk to members of the public.
We have taken the opportunity to remind all employees of the need to be vigilant. Our priority remains serving our communities and protecting them from harm. Officers remain on patrol and our staff continue to respond to calls for service as usual.
ITV News has learned West Midlands Police officers have now been stood down and are allowed to return home.
Officers are back responding but have been told not to use public transport to go home tonight.
ITV News has learned West Midlands Police officers have been told they cannot go home after reports of a "credible security threat."
Officers received the call to return to base at around 10pm.
They have not been told why they cannot return home.
All police officers are involved, including front office staff, controllers, custody staff and PCSOs.
West Midlands Police has refused to confirm reports that officers have been ordered back to their bases because of a security threat.
Sky News claims officers have been asked to watch out for each other when they are out on patrol because of a "credible security threat."
Foreign lorry driver found by officers driving the wrong way down the Black Country Route dual carriageway. Arrested for drink driving.
West Midlands Police say they've arrested a lorry driver going the wrong way down a dual carriageway, who then tested more than twice over the drink drive limit.
Lorry driver going the wrong way down Black Country Route, Walsall has been found to be more than twice over the drink drive limit.
The driver is said to be a foreign national, and was stopped driving the wrong way down the Black Country Route by Traffic Police overnight.
-Watch what the woman with the white hairband does with her umbrella
- Spot what the man does with his piece of paper
West Midlands Police want the public to know these common tricks - so we can protect ourselves during the hectic Christmas period.
Police in the West Midlands are urging people to be on the lookout for pickpockets, as the festive season gets underway.
They have released CCTV footage of previous crimes to show shoppers and revellers how important it is to secure valuables from thieves, particularly in busy areas.
Year on year we have seen people get wiser to these kinds of crimes which means that the number of offences have fallen, but that doesn’t mean we can become complacent.
We’re hoping that by revealing the thieves’ tips and tricks the public can stay one step ahead.