* Players treated for burns
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* Match halted at halftime after players attacked
* Conmebol to meet on Friday to decide outcome of tie (Writes through with players in hospital, Conmebol meeting, more quotes)
BUENOS AIRES, May 14 (Reuters) - Four River Plate players were taken to hospital after they were sprayed with an irritant by fans of bitter rivals Boca Juniors on Thursday, causing their Libertadores Cup derby to be abandoned at halftime.