Central events in ³⁶Ar and ¹⁶O induced reactions on Ag/Br a 65±15 MeV/nucleon and 210±10 MeV nucleon bombarding energy, respectively, have been analysed. For the ³⁶Ar induced reaction a flow energy of about 3 MeV/nucleon has been deduced for intermediate mass fragments. Evaporative processes can be ruled out as the origin of the intermediate mass fragments since the emission time is much larger than the expansion time estimated from the flow analysis.