A bomb explosion near a post office in Rome this morning could have been "an act of protest", say Italian police.
Il Giornale newspaper reports two remote-controlled devices exploded in the city's southern Aventino district. The target was unclear.
No injuries have been reported, but the blasts caused panic and seriously damaged a nearby car.
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The Independent says homemade devices using flammable fluid and remote controls were placed between cars parked in Via Marmorata, close to a post office and a UN building.
While homes and businesses were evacuated, emergency services have told state broadcaster RAI the situation is now under control.
Police believe the bombs could be the work of anarchist groups country, who have carried out fire-bombings in the past, including an arson attack in a warehouse on the southern outskirts of Rome.
It is not thought Islamists were responsible, although Islamic State has singled out Rome as a symbolic target in its propaganda.
Security in the Italian capital has heightened following IS-related terror attacks in Paris, Belgium and elsewhere in Europe.
Last month, an "extremely dangerous" Moroccan was arrested in Italy over alleged plans to stage a major terrorist attack in the country, which is due to host a G7 summit soon.
Travel expert Frank Behany told the Daily Express tourists should be assured that "good and obvious security exists in Rome".
He added: "They should not be overly concerned at this stage."
The UK Foreign Office advises travellers "should be vigilant at this time" as "terrorists are likely to try to carry out attacks in Italy".
