Crime has increased by more than a quarter on London Underground, according to the latest figures from British Transport Police (BTP).
Police are targeting anti-social behaviour on the District Line
Between April 2002 and March 2003 crime rose by 27%, with a 55% increase in pick-pocketing.
Police said the higher figures were partly due to the new way crime is recorded and reflected rises in all police forces in England and Wales.
London Underground (LU) bosses said they would be making safety and security a priority in their plans for the Tube.
One of the highest increases reported by BTP was public disorder offences, which rose by 71% with more than 500 incidents.
Violent crime was up by 32% but robbery fell by 31%.
A surveillance project called Operation Hawkeye, aimed at reducing crime in Tube station car parks, resulted in vehicle crime being reduced by almost half (44%) and theft of railway property by almost a third (32%).
BTP Area Commander for London Underground, Chief Superintendent Steve Hotston said: "Although we have reduced vehicle crime, robberies and theft of railway property, we are not complacent."
London Underground's new managing director Tim O'Toole said the general rise in Tube crime was unacceptable and that BTP manpower would be increased by 20%.
"I have made safety and security central to my plans for the Tube", he said.
"I have been on patrol with the BTP and have brought them into the heart of the Tube's decision-making processes.
"More resources will be put into police manpower with the Mayor providing funding for up to 100 additional officers.
"London Underground is still a safe environment, particularly when you realise that over three million passengers use the Tube every day, more than use all the railways in the rest of the UK."