The U.S. Drug Enforcement Administration has reduced its operations in Peru's cocaine-producing jungle for security reasons, U.S. officials said.

The cutback began two months ago after the security chief of the U.S. Embassy received a minor leg wound in January by gunmen firing at a U.S. helicopter from the ground, said embassy spokesman Charles Loveridge.The violence occurred in the Upper Huallaga valley near Tingo Maria, 240 miles northeast of Lima. Officials say more than 60 percent of the world's coca, the raw material of cocaine, is grown in the region.

Loveridge said the United States was temporarily halting its coca eradication program and interdiction efforts to allow time to analyze the effectiveness of the anti-drug effort.