A technical glitch at CME Group halted electronic trading in corn and other commodities, leaving the world's largest futures exchange operator scrambling to fill orders using shouting floor traders instead of the computers that have largely replaced them.

Futures and options trading in 31 different markets ranging from corn to wheat to live cattle to rainfall futures was halted on Tuesday shortly before 2 p.m. EDT, according to the exchange. CME, based in Chicago, said it resolved the issue about two hours later. A spokesman for the CME declined to comment about the cause of the problem.