Iraqi base with U.S. troops hit by indirect ISIS fire

One of the bases where U.S. forces have been training Iraqis has come under regular, indirect fire from the Islamic State of Iraq and Syria (ISIS.)

The Pentagon, however, describes them as "nuisance attacks," and says none of the rounds have hit U.S. personnel or equipment, reports CBS News correspondent David Martin.

U.S. forces have begun training Iraqi troops at two bases in Iraq - al Assad and Tajii. There are 320 U.S. troops -- mostly Marines -- at al Assad, which is the one that comes under fire regularly.

There are 170 U.S. troops -- mostly Army -- at Tajii, training four battalions of Iraqi troops in a six-week course. U.S. troops will also train Iraqi forces at Irbil and Besimaya, but those sites are not yet in operation. There are currently a total of 2,140 U.S. troops in Iraq out of a total of 3,100 authorized by President Obama.

There has been some more good news in the fight against the Islamic extremist group in control of vast swaths of Iraq and Syria.

Kurdish fighters advanced in the northern Syrian town of Kobani on Monday, capturing a vital zone housing government buildings after heavy fighting with ISIS, a Kurdish official and an activist group said.

Kobani official Idriss Nassan and the Britain-based Syrian Observatory for Human Rights said Syrian Kurdish forces captured the so-called security quarter, which houses the police headquarters and other government buildings.

Kurdish fighters have been slowly advancing in Kobani with the support of Iraqi peshmerga forces. The U.S.-led coalition has also played a key role, carrying out waves of airstrikes against ISIS positions in and around the town.

The U.S. Central Command said eight airstrikes struck two large ISIS units and an ISIS fighting position in Kobani on Sunday. It added that the airstrikes destroyed 11 ISIS fighting positions.