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Gas leak is reportedly to blame for the blast that killed three and injured five people at the Ukrainian city of Nikolayev.
13 names and 2 companies have been added on the EU black list.
The explosion has destroyed three floors of a nine-storey block of flats.
Referendums dedicated to the status of Donetsk and Lugansk Oblasts have been held in East Ukraine.
Novaya Gazeta journalist Pavel Konygin was covering the so-called referendum in Donetsk Oblast.
Over 50% of voters turned out the Lithuanian presidential election to choose one of 7 candidates.
Unknown men destroy ballot papers designed for independence referendum planned by pro-Russian separatists in eastern Ukraine.
The preferences were in place under the US Generalized System of Preferences for developing countries.
Russian president Vladimir Putin on May 7 called on separatists in eastern Ukraine to put off the federalization referendum scheduled for May 11.
