The White House has warned that Syria could be preparing another chemical attack.
According to the BBC, the US says it has identified activities similar to those which took place before a suspected chemical attack in April. That attack led to a US strike on a Syrian air base.
Now a statement from the White House has warned President Bashar al-Assad against a chemical attack, suggesting Syria would pay "a heavy price" for doing so.
It read: "As we have previously stated, the United States is in Syria to eliminate the Islamic State of Iraq and Syria. If, however, Mr Assad conducts another mass murder attack using chemical weapons, he and his military will pay a heavy price."
The statement also claimed a chemical attack by the Assad regime would lead to the murder of many civilians.
Nikki Haley, the US ambassador to the United Nations, said Russia and Iran would also be held responsible over such an attack as they are Assad's key allies.
However, according to reports, the Department of Defense and other officials were not aware of the statement given by the US before its release, as it had not been discussed with other national security agencies.