Tanzania's main university has re-admitted most of the more than 3 000 undergraduate students who were suspended for rioting two weeks ago, a senior Dar es Salaam University official has said in a statement. "Classes have resumed and all students have been screened to determine their role in the demonstration on April 20 and those who have not been re-admitted appear to have played a bigger role in planning and staging the riots," acting chief academic officer JS Mshana said in the statement, issued on Monday night.