A shark killed a surfer Friday off Mexico's Pacific coast — six miles from a beach where an American man was killed in a similar attack last month, authorities said.

Osvaldo Mata Valdovinos, 21, of Mexico, was attacked while surfing off Pantla beach west of Acapulco, said local Civil Protection Director Jaime Vazquez Sobreira. The shark bit off his left hand and broke one of his legs, Vazquez Sobreira said.

The attack came less than a month after Adrian Ruiz, 24, of San Francisco died after being bitten by a shark while surfing off Troncones beach. Mexican authorities used baited hooks to catch sharks in the area the next day.

Environmentalists opposed the hunt and have demanded that authorities post signs in the area's beaches warning about sharks.