In Russia, security has been ramped up after five bodies were discovered in the south of the country.
All the victims, including at least two taxi drivers, were shot dead and found in four separate cars near the city of Stavropol.
Authorities say an improvised explosive device went off near one of the vehicles but nobody was hurt.
Security forces have reportedly been deployed to the region which lies some 300 kilometres east of Sochi, the venue for next month’s Winter Olympics.
Almost 40,000 troops and police are in place ahead of the games, however the latest incident has only heightened security fears in the wake of last month’s twin attack in Volgograd.
That saw 34 people killed in the two suicide attacks, one on a bus the other at the city’s main railway station.