AMSTERDAM, April 16 (Reuters) - Two former Serbian security officials, including the late President Slobodan Milosevic's secret service chief, will go on trial on April 28 after repeated delays, the U.N. war crimes tribunal said on Wednesday.

The start of the trial of Jovica Stanisic and Franko Simatovic, another former commander, was delayed on Monday for the fourth time to allow a video link to be set up for one of the accused.

Stanisic, 57, is accused along with Simatovic of arming and training militias that murdered and persecuted non-Serbs during the 1991-1995 Balkan wars. Both have pleaded not guilty.

The start of their trial has been repeatedly delayed due to Stanisic's health problems.

Last week, the court ruled that he was fit enough to stand trial and ordered a video-conference link to be set up in the detention unit to allow him to follow the proceedings and a telephone line for him to talk to his lawyers.

The trial is expected to provide more details on Serbia's involvement in the fighting in Croatia and Bosnia. (Reporting by Foo Yun Chee; Editing by Giles Elgood)

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