Japanese Yaku macaque monkeys sit around a bonfire to keep themselves warm at Japan Monkey Center in Inuyama in this 2019 file photo. | TAKAHIRO YOSHIDA/SOPA IMAGES/LIGHTROCKET VIA GETTY IMAGES

Local authorities in Japan's Yamaguchi city said Monday they are turning to tranquilizer guns to confront marauding monkeys that have injured 42 people in recent weeks.

Japanese macaques are seen commonly across large parts of the country, and are a pest in some areas, eating crops and even entering homes.

But a spate of monkey attacks in the city in western Japan has been unusual, with adults and children suffering wounds including scratches and bites.

"All of Yamaguchi city is surrounded by mountains and it's not rare to see monkeys," a city official from the agricultural department told AFP, declining to give her name. "But it's rare to see this many attacks in a short period of time."

The injuries have so far been largely mild, but authorities are now turning to tranquilizer guns after traps they set failed to snare any of the pesky primates.

"Initially only children and women were attacked. Recently elderly people and adult men have been targeted too," the official said.

The city isn't even sure if the attacks are the work of multiple monkeys or a single aggressive individual. The intruders have in some cases entered by sliding open screen doors, or entering through windows.

City officials and police have been patrolling the area since the first attacks around July 8, but have yet to snare any monkeys.

The story has made headlines in Japan in recent weeks, with local residents reporting regular invasions.

"I heard crying coming from the ground floor, so I hurried down," one local father told the Mainichi Shimbun daily. "Then I saw a monkey hunching over my child."

Considered a vulnerable species until the early 20th century, Japanese macaque numbers have increased in recent decades. They are currently listed as a species of "least concern" by the International Union for Conservation of Nature.

But the "recovery process has rarely been hailed as a conservation success, because it has triggered serious conflicts between people and the macaques," according to a study from Yamagata University.

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