ISIL terrorist group has executed 100 of its own foreign fighters who tried to flee their headquarters in the Syrian city of Raqqa, the Financial Times newspaper said Saturday.

ISIL terrorist group has executed 100 of its own foreign fighters who tried to flee their headquarters in the Syrian city of Raqqa, the Financial Times newspaper said Saturday.

An activist opposed to both ISIL and the Syrian government, who is well-known to the British business broadsheet, said he had "verified 100 executions" of foreign ISIL fighters trying to escape the 'jihadist' group's de facto capital.

ISIL militants in Raqqa said the group has created a military police to clamp down on foreign fighters who do not report for duty. Dozens of homes have been raided and many 'jihadists' have been arrested, the FT reported.