(CNN) — A charter jet crashed in the South African capital of Pretoria on Tuesday afternoon, leaving about 20 people injured, an emergency medical service company in the area said.

The crash happened in Pretoria’s Wonderboom area, the ER24 emergency response provider said.

“Initial reports show that approximately 20 people had sustained injuries ranging from minor to critical,” the company said in an online statement.

Images of the crash, posted to social media by ER24 and others late Tuesday afternoon, showed emergency responders gathered near the plane’s wreckage in a field.

Details about what led to the crash wasn’t immediately available.

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