GILLETTE, Wyo. (AP) — A Gillette physician says contaminated methamphetamine may have killed two people who were hospitalized over the past three weeks.

Two other meth users also were admitted to Campbell County Memorial Hospital recently with respiratory failure.

Dr. Robert Neuwirth says the four ranged in age from their early 20s to early 50s. He says the two patients who did not die made full recoveries after a day or two on respirators.

The Gillette News-Record reports ( all four were previous drug users who smoked, injected or swallowed the meth.

Neuwirth says he contacted the Campbell County public health officer. State health officials say they're not sure if similar cases have occurred elsewhere in Wyoming recently.