Cape Town – Reports that there was a nationwide radar systems failure at the time a plane crashed in Tygerberg nature reserve are concerning, Air Traffic and Navigations Services (ATNS) said on Monday."We would like to state that these allusions – in the absence of an independent investigation report – are misleading, speculative and lack substance," said spokesperson Percy Morokane.He said all airports, including Cape Town International, were operating normally.Two pilots, a paramedic, a patient and his daughter died in a plane crash on Sunday, at the same time that the Cape Town International Airport experienced a "technical glitch" which caused flight delays.Morokane said the slot coordination system, which allocates an order for incoming and departing air traffic, was affected. It had since been remedied.The plane carried a Namibian crew and a South African patient and his daughter. They were pilot Steven Naude, 53, co-pilot Amore Espag, 23, and paramedic Alfred John Ward.The South African patient was named as 80-year-old Gabriel le Roux, who died alongside his daughter Charmaine Koortzen, 49, a South African who lives in Oranjemund in Namibia.Private ambulance service ER24 released a statement at the time which read: "It is understood from the Airports Company of South Africa that all aircraft approaching Cape Town International Airport at the time were placed in a holding pattern due to a technical fault with their radars."The E-med Rescue 24 aircraft was also in the holding pattern at the time. We lost contact with the aircraft approximately seven miles outside of the airport," the statement said.Morokane said they would co-operate fully with investigations by the transport department’s Aircraft Accident Investigations Unit and the SA Civil Aviation Authority.