WPC Yvonne Fletcher murder case stalls over national security concerns

A suspect in the murder of police officer Yvonne Fletcher outside the Libyan embassy in London will not be prosecuted because important evidence is being withheld on national security grounds.Police said they were unable to charge the man without being able to present the "key material" in court.WPC Fletcher died after being shot in the back while she was policing a demonstration against the then-Libyan ruler Muammar Gaddafi in 1984.