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The National Weather Service said on Tuesday that the tornado was a category EF5, the most powerful category of tornado.    

Rescuers looking for survivors from a huge tornado that flattened homes and schools in Oklahoma were winding down their search.    

The number of asthma attacks or other outbreaks of symptoms decreased by 87 percent in those getting the drug, Dupilumab, compared with those getting a placebo.    

Rather than taking unfair advantage of what Congressional investigators say are a host of tax code loopholes, Timothy D. Cook said, the company was a victim of an outdated tax system.    

Information collected at the border will be used to crack down on visitors who violate laws on the length of their stay, Congressional officials say.    

Preliminary analysis of the storm track showed that it touched down at 2:56 p.m. and traveled about 20 miles in 40 minutes.    

The Justice Department called prosecutor Dennis K. Burke’s actions related to the release of a memo about a federal agent involved in the “Fast and Furious” investigation “particularly egregious.”    

Senator Patrick J. Leahy, the chairman of the Senate Judiciary Committee, suggested that Tuesday could be the last day of debate on legislation to overhaul the immigration system.    

A powerful tornado leveled homes and businesses in and around Oklahoma City on Monday. Preliminary analysis of the storm track showed it touched down at 2:56 p.m. and traveled about 20 miles in 40 minutes.    

Steven T. Miller took responsibility for planting a question at a closed-door meeting that prompted a top I.R.S. official to disclose that the agency had targeted conservative groups.    

Oklahoma residents on Tuesday began the painstaking process of trying to come to grips with what happened, and the uncertain path forward.    

In a televised statement, the president offered prayers and promises of material aid to the victims of the devastating tornado that struck on Monday.    

Live coverage from KFOR-TV in Oklahoma City.    

Leobardo Espinoza Jr., a high school senior in Kansas whose parents did not graduate from high school, expects to “work harder and longer” to compete with his Ivy League classmates this fall.    

Psychologists are beginning to unravel the mystery behind this brand of American political paranoia.    

Homes were flattened, cars flung through the air and at least two schools packed with children destroyed, sending rescuers to dig out those buried in rubble.    

Migrant deaths remain high even as apprehensions have fallen, with tighter borders pushing people to take riskier routes from Mexico to the United States.    

The chances of Gabriel Gomez, the Republican running against Representative Edward J. Markey for John Kerry’s vacated Senate seat, are thought to be fair.    

Officials searched the personal e-mails and tried to track the movements of a Fox News correspondent, James Rosen, in investigating a leak.    

It was the first time that an F.B.I. agent has been killed in the line of duty since December 2011.