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.
Speaking in response to video that's emerged showing a drink seemingly being passed between two moving white vans travelling at speed on the M5, Kevin Clinton from the Royal Society for the Prevention of Accidents says it's more and more likely dangerous driving will be caught on camera.
The footage released by police today shows the vehicles on the M5 in Halesowen, and was filmed by a driver travelling behind by a dashboard mounted camera.
Shocking video footage has been released of two drivers who appear to bring their vans together on the motorway, to pass a drink between the vehicles.
The video, caught on a dashboard camera, was filmed by a motorist travelling behind the vans, along the M5 near Halesowen in September.
The stunt has been condemned by Road safety campaigners who fear it could potentially have caused a major accident.
Police say they're examining the footage to see if any offences have been committed, and will be contacting the drivers.
Police have issued a warning to parents after allegations a 61-year-old man tried to lure a 16-year-old girl into his car on her way home.Read the full story ›
Police investigating a sexual assault on a bus in Birmingham have released CCTV images of a man wanted in connection with the attack.
It is after a man touched a 23-year-old woman inappropriately as she travelled on the 957 National Express bus from Birmingham city centre at around 3pm on Saturday 19 July.
This assault traumatised the young woman who was just going about her journey. She had the courage to challenge the man, however she has been very upset by the incident.