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Italian police Chief Antonio Manganelli said Monday that to date there were no “material” links between the Athens and Rome bombings. But in comments to the ANSA news agency, Chief Manganelli said contacts and synergies between anarchist groups of the two countries constantly are being investigated by joint Greek and Italian police operations.

A group called Conspiracy Nuclei of Fire claimed responsibility for the Greek blasts. It called on militants in Greece and other countries to step up their action, and Greek police noted last week that, in the past, acts of “solidarity” have been carried out between Greek and Italian militant groups.

But though the bombings were similar, Greek police have pointed out that the attacks there seemed not intended to cause injury — and none was caused. In contrast, the Italian attacks seemed intent on at least seriously wounding whoever opened the envelopes.

At least one of the devices contained an iron bolt that shot into the chest of the Chilean employee. That man also risked losing the sight in his eye; both he and the Swiss victim had serious injuries to their hands and arms, hospital officials said.

Associated Press reporters Paolo Santalucia and Martino Villosio in Rome, Derek Gatopoulos in Athens, Jan M. Olsen in Copenhagen and Louise Nordstrom in Stockholm contributed to this report.