<human>:  Why are the Syrian refugees fleeing?
<bot>: They are fleeing because of the civil war and the resulting humanitarian crisis. The civil war has been going on since 2011, and it has killed hundreds of thousands of people. The United Nations estimates that there are around 4 million Syrian refugees, and many of them are living in camps in neighboring countries. The United States has taken in a lot of refugees, but the U.S. government does not want to take in more than the limit of 85,000 refugees per year.