Brussels metro shut as Belgian capital put on maximum alert
A spokesman for Rome's archeological sites said the killing of 129 people by militants in France prompted the decision to set up the devices around the venue that in Roman days hosted gladiator fights.
Italy has increased security in the past week and the United States Embassy in Rome warned US citizens on Thursday that big tourists sites, churches, synagogues, restaurants, theater and hotels in both the capital and in Milan could be targeted.
Terrorism threat: Security of important premises tightened
Security staff at the Colosseum already had hand-held metal detectors but the upgrade should ensure greater protection, the spokesman said.
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