Inquiry into 1972 murder drove wedge into Northern Ireland's gov't.

Rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace.

Russian military attache ordered to leave the country.

Police fired water cannon and tear gas to prevent hundreds of protesters from defying a ban on May Day rallies and reaching Istanbul’s Taksim Square, the focal point of protests last summer.

Hundreds of pro-Moscow separatists stormed government buildings in one of Ukraine's provincial capitals on Tuesday and fired on police, a major escalation of their revolt despite new sanctions on Russia.

P.M. Tayyip Erdogan says Fethullah Gulen has plotted against him.

Russia has condemned new sanctions that have been imposed over Moscow's actions in Ukraine. Moscow said the E.U. should be ashamed of extending its sanctions and was "under Washington's thumb."

Attempted assassination has raised tensions ahead of new sanctions.

Move comes amid continuing action by pro-Russia separatists in Ukraine.