Story highlights Death toll could rise to 20, police say

Police: The pilot survived but is critically injured

Plane crashed on England's A27 highway

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(CNN) Police said Monday that the death toll from the crash of a plane onto a highway Sunday at an air show in southeastern England "may rise" from the current "highly likely" count of 11.

"However, we do not expect that figure to be greater than 20, probably fewer," said Assistant Chief Constable Steve Barry, of Sussex Police.

Two days after a relic military jet plunged from the sky and crashed onto a busy UK highway, authorities searched for more possible victims.

Sussex police announced Sunday at a press conference that they had the names of 11 people whom they are treating as "highly likely" to be dead. The identification process was a "technical" one that requires the help of the victims' next of kin. Earlier, they said seven people had been killed.

Officials said a crane would be brought in Monday to haul the wreckage from the site.