'Russia's intent is to prolong the life of Assad' - US backed Syrian rebels accuse Moscow of bombing them
Russian jets have carried out a second day of strikes in Syria, with some activists claiming the targets included rebels backed by the United States.
Russia's Defence Ministry spokesman Igor Konashenkov said Russian aircraft damaged or destroyed 12 targets in Syria belonging to the Islamic State group including a command centre and two ammunition depots.
Officials acknowledged, however, that other unidentified groups were being targeted as well.
Mr Konashenkov said Russian Su-25M and Su-25 jets made 20 attacks between Wednesday and Thursday morning but insisted civilian areas were not targeted despite claims by some groups in the area.
Khaled Khoja, head of the Syrian National Council opposition group, said that Russian airstrikes in four areas, including Talbiseh, killed 36 civilians including five children.
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"Russia is intending not to fight ISIL [Islamic State], but to prolong the life of [Syrian President Bashar] Assad," Mr Khoja said.
The British-based Syrian Observatory for Human Rights said airstrikes in the central province of Hama on Thursday hit locations of the US-backed rebel group, Tajamu Alezzah.
The British group said Tajamu Alezzah was also targeted on Wednesday.
Russia's air campaign in support of Syrian government forces began on Wednesday in what President Vladimir Putin called a pre-emptive strike against the militants.
Mr Putin's spokesman Dmitry Peskov told reporters on Thursday that Russia was targeting IS militants as well as a "list" of other groups.
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"These organisations are well known and the targets are chosen in coordination with the armed forces of Syria," he said.
On Wednesday, however, Sergei Ivanov, Mr Putin's chief of staff, said "the operation's target is solely air support for the Syrian government forces in their fight against the ISIS".
Speaking later in the day, Mr Putin said Russia would be fighting "gangs of international terrorists" and then went on to talk about IS.
Asked whether Mr Putin was satisfied with the way the Russian campaign was going, Mr Peskov said it was "too early" to say.
In Paris, Russian Ambassador Alexander Orlov insisted that Russian warplanes in Syria were hitting at the same extremists targeted by the United States and denied American claims that its military failed to coordinate the airstrikes, describing the allegations as a "war of disinformation".
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Mr Orlov said the targets were installations for Islamic State and the Nusra Front, al-Qaida's affiliate in Syria, "two terrorist organisations recognised as such".
The US and Russia agree on the need to fight the Islamic State but not about what to do with President Bashar Assad.
The Syrian civil war, which grew out of an uprising against Mr Assad, has killed more than 250,000 people since March 2011 and sent millions of refugees fleeing to other countries in the Middle East and Europe.