KIEV, March 4 - Ukraine's telecommunications system has come under attack, with equipment installed in Russian-controlled Crimea used to interfere with the mobile phones of members of parliament, the head of Ukraine's SBU security service said on Tuesday.

"I confirm that an IP-telephonic attack is under way on mobile phones of members of Ukrainian parliament for the second day in row," Valentyn Nalivaichenko told a news briefing, Reuters reported.