The attack followed protests by Greek anarchist groups in support of a jailed Italian anarchist militant who is on hunger strike in protest against prison conditions.
The envelopes had "similar characteristics" and were sent from inside Spain, director general of the Civil Guard said, citing preliminary investigations.
Police have opened an investigation "which includes the participation of forensic police," the source said without giving further details.
Among the artworks, is a photo of a William Shakespeare-inspired private collection picturing burlesque artist Janet Fischietto as Katherine, protagonist of Shakespeare's comedy "The Taming of the Shrew."
These politicians endanger safety and welfare of their own people with their actions, says Turkish Defence Minister Hulusi Akar.
Syriza claimed that PM Mitsotakis constitutes an existential threat to Greek democracy.
The Italian government released the first tranche of two million dollars in relief funds following a deadly landslide in the south of the country, where rescuers are still searching for a dozen missing people.
The Ark of the World, established in 1998 in Athens by Father Antonios Papanikolaou, says it aims to "take care of unprotected children" but it is now the centre of an investigation by Greek authorities.
Around ten people remain missing as rescue efforts have been hampered by continued rain and high winds, which also delayed ferries bringing reinforcements to Ischia island from the mainland.
President Vucic underlined that Belgrade was "completely constructive" during the talks, insisting on the "implementation of the signed agreements that were changed 10 times."
Tension has risen between the two sides after Pristina declared that by next April, around 10,000 Kosovan Serbs with licence plates issued by Serbia must replace them with plates from the Republic of Kosovo.
“Our flags and the TRNC are our sanctuaries," says Turkish Cypriot President Ersin Tatar.
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