Explosive experts are attending a potential hostage situation at Tottenham Court Road in central London, Sky sources confirm.

There are reports that four people have been taken hostage at the building.
The man is reported to be angry he did not get an HGV Licence and walked into the building saying he had nothing to live for.
Police were called when the man was throwing computers and furniture from the building.
He is said to have a gas cannister tied to him.
A trained hostage negotiator is en route to the scene.
Hundreds of people have been evacuated from surrounding buildings.
Armed police are at the scene and the area is at a standstill.
Police have only confirmed that it is not a terrorist incident and 'a man who is causing a disturbance and criminal damage at an office building'..