Commander Chris Yates said the threat in the district was “severe”, and had been for “a long time” .
“Severe means that an attack is highly likely and the figures bear that out,” he said.
“In 2008/09 there were 28 terrorists offences within G District. Last year there was 106. We are on an upward slope.”
He added: “Last year we had about 15 pipe bombs in the district, most of them would have been across Foyle. This year, to date, we are up to 16.
“We are on a par this year with what we saw last year, and last year was a particularly bad year.”