The Turkish military has sent additional tanks into northern Syria. The U.S. military is backing Turkey’s ground offensive, which began earlier this week. Turkish officials say there are now at least 20 Turkish tanks inside Syria and that more could be deployed in the coming days. The U.S.-backed Turkish offensive is aimed at taking control of ISIS-held towns along the border. On Wednesday, Turkish tanks and U.S. air support helped the Free Syrian Army oust ISIS from Jarabulus. Turkey also seeks to force Kurdish militias to retreat from the border. These militias are backed by the United States. Vice President Joe Biden was in Ankara on Wednesday.