The Home Office is not confirming or denying whether any British workers have been involved.
But officials say they are investigating reports which suggest at least one Briton was taken when gunmen stormed a compound belonging to a Lebanese construction company in Nigeria.
ITV News reporter Sejal Karia talks from outside the Foreign Office:
More top news
Heavy snowfall has caused chaos for many across the country as roads and schools have been shut due to the inclement weather.
Saudi Arabia will allow cinemas to open from next year for the first time in more than 35 years.
Two people have been injured in a house explosion this morning.