Government troops launched one of their biggest ground attacks yet on rebel held areas in Aleppo, Syria's largest city.
Gaining control of Aleppo is key in the rebels' plan to take down Syrian President Bashar al-Assad.
It's still unclear who has the upper hand in the ongoing battle, but rebels say they won't give up.
Thousands of civilians are fleeing the violence. They say the rebels are their only hope of freedom.
"We must have freedom," said Mohamad Zetoon, one of Syria's internally displaced persons. "That's what I'm talking about, and every child and every family, they need that. They need just freedom."
Iran and Russia are key supporters of the Syrian government.
Wednesday, Iran gathered the ministers of unnamed countries to discuss a way to end the conflict.