Looking for His glorious appearing! Titus 2:13

The Syrian Observatory for Human Rights, which monitors the civil war, said heavy clashes erupted in Kobani and that both sides had suffered casualties, while the U.S. military said it had launched more air raids on Islamic State over the weekend.

Idriss Nassan, deputy minister for foreign affairs in Kobani district, said Iraqi Kurds using long-range artillery had joined the battle on Saturday night against Islamic State, which holds parts of Syria and Iraq as part of an ambition to redraw the map of the Middle East.

"The peshmerga joined the battle late yesterday and it made a big difference with their artillery. It is proper artillery," he told Reuters.

"We didn't have artillery we were using mortars and other locally made weapons. So this is a good thing."

Nassan did not elaborate and it was not immediately possible to verify that progress against Islamic State had been made.

The arrival of the 150 Iraqi fighters -- known as peshmerga or "those who confront death" -- marks the first time Turkey has allowed troops from outside Syria to reinforce Syrian Kurds, who have been defending Kobani for more than 40 days.