Story highlights All bodies have been recovered from the mine, officials say

Methane is suspected in the blast at the Zasyadko mine in the Donetsk region

Ukrainian leaders accuse separatists of not giving access to Ukrainian rescue teams

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.

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