* Ukrainians accuse Russia of atrocities in Kyiv region
* Russia denies accusations, calls for UN meeting
* German minister: EU must discuss Russian gas import ban
* Ukrainian, European officials call for war crimes probe
* Fighting continues in other parts of Ukraine
By Simon Gardner
BUCHA, Ukraine, April 4 (Reuters) - Ukrainian authorities were investigating possible war crimes by Russia after finding hundreds of bodies, some bound and shot at close range, strewn around towns near Kyiv after Kremlin forces withdrew to refocus their attacks in other parts of the country.
In the town of Bucha, 37 km (23 miles) northwest of Kyiv's city centre, Reuters reporters saw a man lay sprawled by the roadside, his hands tied behind his back and a bullet wound to his head.
Bucha's deputy mayor, Taras Shapravskyi, said 50 of some 300 bodies, found after Russian forces withdrew from the city late last week, were the victims of extra-judicial killings carried out by Russian troops.
Reuters could not independently verify those figures or who was responsible for the killings.
Russia's defence ministry said in a statement issued on Sunday that all photographs and videos published by the Ukrainian authorities alleging "crimes" by Russian troops in Bucha were a "provocation," and no resident of Bucha suffered violence at the hands of Russian troops.
Satellite images showed a 45-foot-long trench dug into the grounds of a Ukrainian church where a mass grave was found this week. Reuters reporters in Bucha visited a mass grave at one church that was still open, with hands and feet poking through the red clay heaped on top.
Pictures of the destruction and apparent violence towards civilians sparked widespread condemnation of Russia and leader Vladimir Putin. U.S. Secretary of State Antony Blinken described the images as "a punch in the gut," while United Nations Secretary-General Antonio Guterres called for an independent investigation.
"Putin and his supporters will feel the consequences," said German Chancellor Olaf Scholz, adding that Western allies would agree on further sanctions in the coming days.
Germany's Defence Minister Christine Lambrecht said the European Union must discuss banning the import of Russian gas - a departure from Berlin's prior resistance to the idea of an embargo on Russian energy imports.
Russia requested the U.N. Security Council convene on Monday to discuss what Moscow called a "provocation by Ukrainian radicals" in Bucha.
Russia has previously denied targeting civilians and has rejected allegations of war crimes in what it calls a "special military operation" aimed at demilitarising and "denazifying" Ukraine. Ukraine says it was invaded without provocation.