The U.S. administration is considering a plan to greatly increase the number of American special operations forces deployed to Syria as it looks to accelerate recent gains against the Islamic State group, U.S. officials told Reuters.

The officials, with direct knowledge of the proposal's details, declined to disclose the exact increase under consideration. But one of them said it would leave the U.S. special operations contingent many times larger than the 50 or so troops currently in Syria, where they operate largely as advisers away from the front lines.

The proposal is among the military options being prepared for President Barack Obama, who is also weighing an increase in the number of American troops in Iraq. A White House spokeswoman declined comment.