(CNN) -- Oklahoma State University women's basketball coach Kurt Budke and assistant coach Miranda Serna were killed when their plane crashed on the way to a recruiting trip in Arkansas, university officials said Friday.

Former Oklahoma state Sen. Olin Branstetter and his wife, Paula, also died in the crash Thursday, university spokesman Gary Schutt said.

"It's a terribly sad day," he said.

The crash occurred in Perry County, Arkansas, leaving no survivors.

The plane, a Piper Cherokee PA-28, according to FAA records, crashed under "unknown circumstances" in a wooded area about four miles south of Perryville, Arkansas, about 4:30 p.m. CT on Thursday, agency spokesman Lynn Lunsford said Friday.

No additional information about the crash was immediately available.

The National Transportation Safety Board has sent investigators to the crash site, the agency said Friday.

Budke and Serna were on a recruiting trip to Little Rock, Arkansas, the university said.

"For any coaching community to lose bright stars like Kurt and Miranda is tragic," NCAA President Mark Emmert said in a statement. "This is a profound loss for the Oklahoma State women's basketball family, the entire university and future women's basketball players as well."

University officials credited Budke for turning the school's women's basketball program around, culminating with a top-10 national ranking and an appearance in the second round of the NCAA tournament last season. He was in his seventh season with the school.

"Kurt was an exemplary leader and a man of character who had a profound impact on his student-athletes," Oklahoma State President Burns Hargis said. "He was an outstanding coach and a wonderful person. We send our deepest sympathies to his wife, Shelley, and their children, Sara, Alex and Brett."

What are the answers to this following set of questions:

1. Who is the coach of the Oklahoma State University women's basketball team?
2. Who is the assistant coach?
3. What happened to their plane?
4. What were they doing in Arkansas?
5. Which county did it crash in?
6. Did anyone survive?
7. What kind of plane was it?
8. Why did it crash?
9. When?
10. Who is Lynn Lunsford?
11. Who sent investigators?
12. Who is the NCAA President?
13. How long had Budke been coaching there?
14. Who is the president of Oklahoma State?
15. Did Kurt have kids?
16. Did he have a wife?
17. What is her name?
1. Kurt Budke
2. Miranda Serna
3. It crashed
4. Recuiting
5. Perry
6. unknown
7. A Piper Cherokee PA-28
8. unknown
9. About 4:30 p.m. CT on Thursday
10. unknown
11. The National Transportation Safety Board
12. Mark Emmert
13. seven seasons
14. Burns Hargis
15. yes
16. yes
17. Shelley