Air traffic control company Nats said it is restricting aircraft flying across the south of England.
The air traffic restrictions is also affecting flights taking off from airports because of technical problems at its Swanwick control centre in Hampshire.
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Essex Police say that they can't comment on Martin Goldberg's death, but there were indications of an attempt to destroy evidence.
Police say indecent images of children have been found at the home of a deputy head teacher, who was recently found dead.
Essex Police say pictures of boys undressing have been discovered in the home of a teacher who's been found dead.