Something to really worry about.

Today's front page headline in the Washington Post reads, "Extremist Tide Rises in Pakistan."

A potentially troubling era dawned Sunday in Pakistan's Swat Valley, where a top Islamist militant leader, emboldened by a peace agreement with the federal government, laid out an ambitious plan to bring a "complete Islamic system" to the surrounding northwest region and the entire country.

Speaking to thousands of followers in an address aired live from Swat on national news channels, cleric Sufi Mohammed bluntly defied the constitution and federal judiciary, saying he would not allow any appeals to state courts under the system of sharia, or Islamic law, that will prevail there as a result of the peace accord signed by the president Tuesday.

"The Koran says that supporting an infidel system is a great sin," Mohammed said, referring to Pakistan's modern democratic institutions. He declared that in Swat, home to 1.5 million people, all "un-Islamic laws and customs will be abolished," and he suggested that the official imprimatur on the agreement would pave the way for sharia to be installed in other areas.

Mohammed's dramatic speech echoed a rousing sermon in Islamabad on Friday by another radical cleric, Maulana Abdul Aziz, who appeared at the Red Mosque in the capital after nearly two years in detention and urged several thousand chanting followers to launch a crusade for sharia nationwide.

The article later cites Richard C. Holbrooke, President Obama's special envoy to the region who said that the decision by insurgents to keep fighting in spite of the peace deal should be a "wake-up call to everybody in Pakistan that you can't deal with these people by giving away territory as they creep closer and closer to the populated centers of the Punjab and Islamabad." That may well be the wisest bit of advice to come out of the Obama administration thus far, although it may unsettle those who think these sorts of "peace agreements" have all that much to do with peace. Or with those who think concerns about "creeping sharia" in the West is "alarmist."