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More than 4,200 Iraqis from Mosul fled to Syria in May, Reuters reports referring to data by the United Nations refugee agency.

According to the source, it is gearing up for up to 50,000 people to leave the Islamic State-held city and cross the border.

Driving the exodus appear to be reports that IS militants have stepped up executions of men and boys in Falluja since Iraqi government forces launched an offensive to re-take the city, where people are also dying of starvation, the U.N. High Commissioner for Refugees (UNHCR) said.

The spurce reminds, that Iraqi army launched an offensive on Monday to dislodge the ultra-hardline Sunni militants from Falluja, 50 km (32 miles) west of Baghdad. Falluja was the first Iraqi city to fall under Islamic State control, in January 2014, and has been under a tight siege for about six months. Iraqi forces, with help from a U.S.-led coalition, are expected to push later this year to retake Mosul, Islamic State's de facto capital in Iraq.

The UNHCR has begun a five-day air lift to bring aid supplies from Jordan to Qamishly, where it will be loaded on trucks for distribution to Iraqi refugees and internally displaced Syrians.