Kiev , Ukraine ( CNN ) The bodies of all 33 workers killed in coal mine explosion Wednesday in eastern Ukraine have been recovered , officials with the Donetsk regional authority said . Preliminary information indicates the explosion at Zasyadko mine was caused by methane gas , according to DAN , the official news agency for the self-proclaimed Donetsk People 's Republic ( DPR ) . `` This did not happen because of shelling , '' an emergency services official told the news agency . The explosion occurred just before 6 a.m. local time , when 230 people were at the mine , the official website for separatist-controlled Donetsk city said . Of those , 157 were evacuated in the initial hours after the blast , including 14 injured and one dead , according to the website . Fifteen rescue teams are working at the scene , it said . Zasyadko mine is one of the most dangerous in terms of methane in Ukraine , according to the Ukrainian news agency Ukrinform , which reported that 240 people had died at the mine since 1999 -- 101 miners were killed in a single accident in 2007 . Ukrainian Prime Minister Arseniy Yatsenyuk , speaking at a Cabinet meeting , accused the pro-Russian separatists who control the area of denying Ukrainian rescue teams access to the site , Ukrinform reported . He urged Russia to tell the separatists to allow in the rescue workers . `` You took millions of Ukrainians in Donetsk and Luhansk hostage and are now brutalizing miners ' families by not letting in help , '' Ukrinform quoted him as saying . Ukrainian President Petro Poroshenko also called for rescuers to be allowed in . `` I demand Ukrainian rescue workers and investigators to be granted access at the site of the tragedy , '' he tweeted . However , DPR representative Denis Pushilin said Ukraine had not offered help with the rescue , and the DPR will ask Russia or separatist authorities in Luhansk for help if needed , according to the separatists ' news agency . Separatist leader Aleksandr Zakharchenko issued an order to close the mine a month ago , but managers ignored the order because the mine legally belongs to Ukraine , Ukrinform cited the separatist news agency as saying . A shaky ceasefire is currently in place in Donetsk and the neighboring Luhansk region , the center of a months-long conflict between pro-Russian separatists and Ukrainian government forces . Journalist Victoria Butenko reported from Kiev , and Laura Smith-Spark wrote in London . CNN 's Steve Almasy contributed to this report .
All bodies have been recovered from the mine , officials say . Methane is suspected in the blast at the Ukrainian mine in the Donetsk region . Zasyadko leaders accuse separatists of not giving access to Zasyadko rescue teams .