Hundreds of people were told to evacuate from The Old Vic Theatre in central London at about 2.40pm (Singapore 9.40pm) on Saturday afternoon (May 27). The BBC reported that the evacuation took place after police were alerted to a bomb threat.
The incident occurred during the production of Woyzeck, where the lead role is played by John Boyega from Star Wars.
The Old Vic Theatre is situated near Waterloo station.
According to Transport for London, buses serving the Waterloo area were disrupted during the incident and nearby pubs and restaurants were also evacuated. Those people evacuated assembled in the gardens of the Imperial War Museum.
On-lookers at the scene said on social media that armed police had cordoned off the area and that ambulances and detection dogs were present.
The incident happened just five days after a suicide bomb attack on a pop concert in Manchester.