Reuters reports:

Taliban leader Mullah Mohammad Omar vowed a ferocious offensive against U.S.-led forces in Afghanistan, saying on Thursday they would soon face unimaginable violence.

An insurgency that has killed more than 1,500 people since the start of last year has intensified in recent months with a wave of suicide bombings, including at least 12 this year.

Ten U.S. troops have been killed in combat this year and U.S. commanders have said they expect violence to increase in coming months as the weather warms, snow on mountain passes melts, and Afghanistan’s traditional fighting season begins.

“With the arrival of the warm weather, we will make the ground so hot for the invaders it will be unimaginable for them,” Omar said in his message, read by Taliban spokesman Mohammad Hanif over the telephone from an undisclosed location.

Looks like they’re angling for Yale scholarships, eh? John Fund has the latest on that controversy here.