The Wall Street Journal reports: The militant group behind the park massacre here this week on Tuesday threatened to unleash a wave of new attacks, as the government rounded up thousands of suspects.

The Easter Sunday bombing that killed 72 people was the latest in a series of bloody assaults by Jamaat-ul-Ahrar extremists over the past two years, which has established them as the most brutal and capable militant group in the country. The Pakistani Taliban affiliate’s network, officials say, reaches into the country’s heartland of Punjab province, whose capital Lahore is Prime Minister Nawaz Sharif’s hometown and political base.

“Let Nawaz Sharif know that this war has now reached the doorstep of his home,” Ehsanullah Ehsan, the militant group’s spokesman, said in a Twitter post on Tuesday, announcing a new campaign of violence. “God willing, the winners of this war will be the righteous holy warriors.” [Continue reading…]