US embassy warns citizens in UK as threat level raised to ‘severe’

The United States embassy in London has issued a security alert advising its citizens in the United Kingdom to be cautious due to the raised national threat level to "severe". The embassy advises citizens to remain alert in public places, stay away from schools, churches, tourist locations and transportation hubs, and vary their travel routes and times to reduce predictability. The UK's domestic intelligence agency, MI5, has raised the threat level from "substantial" to "severe", indicating a highly likely attack within the next six months.