Thai officials say three military men were killed and another was injured Sunday when a Thai army helicopter crashed near the border with Burma.

It was the third military helicopter to crash in the same area in just over a week. Sunday's crash brought the total fatalities in the three accidents to 17.

The Bell 212 aircraft was on a mission to retrieve bodies from a crash Tuesday. That helicopter went down as it was flying to the site of a July 16 crash.

Nine people were killed in Tuesday's crash. The first crash took the lives of five people.