In a country where an examinee in a university graduate program merely writes his cell phone number on his exam paper so the grader can call him to arrange the bribe payment for a passing score, what do you really expect?
Bribery and corruption are firmly entrenched. It is a way of life. I would expect the initial arrests were motivated by some dispute over sharing bribe money or whose relatives would get a particular position. Its simply too much of a universal practice throughout all levels of society there for anyone to have upset the apple-cart for what we would term a proper motive.