The United States has said it is "appalled" by Syrian regime airstrikes in the rebel stronghold of Raqqa, which have killed at least 95 people.
The US State Department also accused the Syrian government of "not stopping its slaughter", reports AFP.
The Syrian army's airstrikes on Raqqa two days ago were the deadliest since Islamic State extremists took control of the Syrian city last year and declared it their capital.
It is not yet known how many ISIL members were killed, but the Syrian Observatory for Human Rights said more than half of the victims were civilians.
State Department spokeswoman Jen Psaki said that Washington condemns these attacks and noted that it believes that the regime in Damascus "does not value human life at all."
"We are appalled by reports that the Assad regime is responsible for the killing of dozens of civilians and the destruction of residential neighborhoods," Psaki said in a statement.
She assessed that the Syrian president has lost the right to rule and that he should be held accountable for his actions.
"We were clear that Assad lost the legitimacy to rule long ago and that the Syrian regime must be held accountable for its brutality and crimes against the Syrian people," a State Department official said.
Psaki blamed the Syrian government for constant violations of human rights, accusing it of murders, kidnappings, disappearances, torture, rape, sexual violence...
The US formed a coalition with more than 60 countries in the world in order to destroy ISIL, but President Barack Obama rejected the possibility that a coalition could be established with Damascus as well.
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