ISIS has kidnapped 700 people, including dozens of women and children, from a refugee camp in eastern Syria, and will 'kill ten hostages every day' unless their demands are met, Vladimir Putin said today.

The Islamist terrorists have already murdered a number of hostages, and have warned of daily executions to come, the Russian President said.

ISIS fighters attacked the refugee camp in Syria's Deir-al Zor province last week, and kidnapped some 130 families, including several U.S. and European nationals, who may be foreign fighters or aid workers.

Images shared on social media by terrorist monitoring groups allegedly shows ISIS fighters attacking and kidnapping fighters from the U.S.-backed Syrian Democratic Forces in the same area the day before.

ISIS attacks: Photos are said to show an ISIS attack on U.S.-backed Syrian Democratic Forces in the same area as the refugee camp where terrorists kidnapped hundreds

The images shared on social media show men being kidnapped at gunpoint in Syria, allegedly by ISIS fighters in an attack last week

Moving in: The photos allegedly show ISIS fighters attacking on foot in eastern Syria, last week

ISIS militants attacked the refugee camp in an area of eastern Syria controlled by U.S.-backed forces on October 13, kidnapping around 130 families before taking them to the nearby city of Hajin.

The Britain-based Syrian Observatory for Human Rights, which monitors Syria's ongoing civil war, said the families are mostly made up of foreign women, including widows of ISIS fighters.

Speaking at the Valdai discussion forum in the Black Sea resort city of Sochi, Putin said ISIS leaders had made demands, but did not specify what they were.

However, The Observatory reported this week that negotiations have begun, and that ISIS are demanding 'food and medical supplies' in exchange for the hostages' safe return.

'They have issued ultimatums, specific demands and warned that if these ultimatums are not met they will execute ten people every day.

'The day before yesterday they executed ten people,' Putin said, adding: 'This is just horrible, it is a catastrophe.'

Convoy: This is reportedly the moment ISIS fighters leave the SDF camp - ISIS flags can be seen being flown on two of the cars

Last week's attack - separate from the kidnappings at the refugee camp - was allegedly also carried out near Hajin in Deir ez-Zor province, and saw ISIS set buildings on fire

Attack: ISIS fighters attacked the refugee camp near Hajin last week, and kidnapped some 130 families - nearly 700 people - including several U.S. and European nationals

ISIS fighters attacked the refugee camp in Syria's Deir ez-Zor province, and are now threatening to kill ten people every day unless their demands are met, Vladimir Putin said

The attack on the refugee camp in Deir ez-Zor last week came after several days of intense clashes between ISIS and the U.S.-backed Syrian Democratic Forces.

The SDF said in a statement that the fighting in the Hajin refugee camp on October 13 which resulted in the kidnapping, had left 20 ISIS gunmen and 'several' SDF fighters dead.

Since ISIS lost most of its self-declared caliphate in Syria and Iraq over the past two years, the extremists have been resorting to attacks on civilians to show that they are still effective, the Observatory said.

Earlier this week, the United Nations warned that the fight for Hajin, where the SDF estimates some 3,000 ISIS fighters remain, was having a 'devastating' effect on thousands of civilians.