Police are continuing to investigate an alleged "minor physical assault" on a schoolgirl at a popular Whanganui park.

The Bason Botanic Gardens on Rapanui Road were closed around 2pm on Tuesday after police were called to an alleged assault inside the park.

A police spokesperson said yesterday they were told a student, from outside of Whanganui, was at the gardens and was approached by a male she did not know. A van-load of students from a Manawatu school was observed at the park.

"It was also reported that a minor physical assault had taken place," a police spokesperson said.

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The girl ran off and raised the alarm.

"Police attended the scene and conducted an area search, and are making further inquiries."

The park was re-opened about an hour later.