Rangers have been issued a licence to kill dingoes responsible for three attacks on tourists at Karijini National Park in less than a week.

The search for the problem dingoes has been ramped up with multiple rangers patrolling Dales Campground during daylight hours and nine to patrol overnight.

The most recent attack was on Wednesday evening when a four-year-old girl was bitten on the leg and her mum also attacked while trying to protect the little girl.

They were both treated at the scene before being taken to Tom Price Hospital.

Parks and Wildlife revealed an aggressive dingo nipped at the clothing of a six-year-old girl days earlier on Saturday morning before a six-year-old boy was bitten on the neck and arm on Monday evening. All attacks occurred at the campground.

The injured boy’s parents took him to Tom Price hospital to be treated.

A Department of Biodiversity, Conservation and Attractions spokesperson said ranger patrols had increased after the initial attack and the intent was to locate and “humanely destroy” the problem dingoes.

Nine staff members, including a dingo management specialist, are on patrol.

DBCA Pilbara Regional Leader Conservation Hamish Robertson urged adults to keep a close eye on children while at the campsite.

“Secure food and waste, and follow all safety advice provided by park staff,” Mr Robertson said.

DBCA is contacting campers due to arrive at the campground for the long weekend and those with children will be offered an alternative campsite at the park.

Dales Campground remains open, with park rangers and campground hosts advising campers of the dingo risk on arrival and providing safety information.

There is permanent dingo safety signage installed at several locations within Dales Campground.