A leading international human rights group says more than half of the nearly 500,000 school-age Syrian children registered in Lebanon do not go to school and receive no formal education.

Human Rights Watch says that although Lebanon has allowed Syrian refugee children to enroll for free in public schools, limited resources and residency, as well as work restrictions on their parents, are keeping the kids away from school.

The New York-based group's findings come in a new report released on Tuesday.

Since Syria's conflict began in March 2011, hundreds of thousands of Syrians have fled to Lebanon, which is now home to some 1.1 million registered refugees.

HRW said there are nearly 500,000 Syrian children between the age of three and 18 in Lebanon.