MPs angry at what they see as betrayal of anti-austerity principles announce decision in letter to parliament after Alexis Tsipras’s resignationHardline rebels have confirmed an irreparable split in Greece’s ruling Syriza movement and broken away to form a new anti-austerity party as the country heads towards its fifth general election in six years.The long-awaited move by up to 29 dissident Syriza MPs on Friday followed the resignation of the prime minister, Alexis Tsipras, who stepped down on Thursday to pave the way for a snap poll widely forecast to strengthen his hold on power. Related: Greek elections: Alexis Tsipras makes a calculated gamble Related: As Tsipras uses the polls for his own ends, democracy fatigue threatens | David Patrikarakos Related: Greek bailout Q&A: What happens next? Continue reading...