Saudi Arabia and the United Arab Emirates dropped 80 percent of the bomb tonnage in the third round of strikes, compared to other strikes in which the United States lead Arab partners. On 26 September, the U.S. carried out a fourth round of airstrikes on ISIL targets in Eastern Syria. The strikes were targeting ISIL heavy equipment and destroyed four of their tanks in the Deir ez-Zor Governorate. In a fifth round of airstrikes in Syria on 27 September, the U.S. led strikes along with Saudi Arabia, Jordan and the UAE against ISIL forces in the Kobanî Canton of Syrian Kurdistan. The strikes destroyed two armored vehicles and an unknown number of fighters in an area that had been under siege by ISIL militants. The siege by Islamic State fighters had recently forced over 100,000 Syrian Kurds to flee across the border to Turkey. On 28 and 29 September, the U.S. carried out two rounds of strikes against ISIL positions across Syria in 4 provinces. Among the facilities targeted was the entrance to the largest gas plant in Syria, in Deir ez-Zor Governorate, and ISIL training camps and vehicles near an ISIL-controlled grain silo in Manbij. In an eighth round of airstrikes in Syria on 1 October, the U.S. and coalition partners struck ISIL targets in Northern Syria. The daytime strikes targeted ISIL forces laying siege to Kobanî, a primarily Kurdish city in Syrian Kurdistan, in support of the People's Protection Units (YPG) and Free Syrian Army, who were defending the city. On 2 October, the U.S. led a ninth round of strikes, along with the UAE, against ISIL forces across Syria. The strikes destroyed an ISIL checkpoint near Kobanî, damaged a tank north of Sinjar Mountain, destroyed a tank west of Raqqa, and destroyed several ISIL facilities east of Aleppo. In a 10th round of airstrikes in Syria on 3 October, the U.S., assisted by Saudi Arabia and the UAE, struck ISIL forces in Northern and Eastern Syria. The strikes destroyed an ISIL garrison south of Al-Hasakah, destroyed two tanks southeast of Deir ez-Zor, destroyed two modular oil refineries and a training camp south of Raqqa, and struck an ISIL building northeast of Aleppo. On 4 October, the U.S. led an 11th round of airstrikes, along with Jordan, Saudi Arabia, and the UAE, against ISIL forces across Syria. The U.S. and partner nations carried out nine strikes, destroying an ISIL infantry unit, armored personnel carrier, and a vehicle south of Kobanî.