OSLO - Norwegian police said on Sunday that a British police expert was aiding a probe of attacks that killed at least 93 people as part of cooperation with foreign forces."We have received help from the Metropolitan police in London by a criminal technician expert," acting police chief Sveinung Sponheim told a news conference. He said that Norwegian police were also sending out information via Interpol.Sponheim also said that a police officer had been due to be on the island where the gunman massacred at least 86 people. It took about an hour for police to arrive."There was supposed to be a police officer there," he said, adding that it was unclear where he was.