Roughly a 100,000 people fled Syria during the month of August, according to the United Nations, the highest monthly number of refugees since the conflict began in March.

A U.N. spokeswoman said more than 230,000 Syrians have now become refugees. 

"If you do the math, it's quite an astonishing number," U.N. refugee agency spokesman Melissa Fleming told reporters Tuesday at the U.N.'s European headquarters in Geneva.

"And it points to a significant escalation in refugee movement and people seeking asylum, and probably points to a very precarious and violent situation inside the country," she said.

Meanwhile, The Red Cross warned supplies are running low inside Syria, and many areas are impossible for volunteers to access.

Syria's violence is getting worse as rebels fight for control of the city of Aleppo.

Activists say August was the bloodiest month so far, with almost 5,000 people killed.