Speaking at Home Office questions in the Commons, Theresa May said: "He has experienced the service evolving over the years and as Director General has lead the service through particularly challenging times of change and unrest, including the aftermath of the 7/7 bombings.
"His tireless work helped ensure the delivery of a safe and successful Olympic and Paralympic Games last year.
"I commend and thank him for his invaluable contribution to public safety and national security."
Shadow Home Secretary Yvette Cooper said: "We also give thanks for the work Sir Jonathan Evans has done over many years for the security of this country."
More top news
According to local reports, the repairman had failed to disconnect the power to the escalator before getting to work.
Millwall fans who caused problems at the match against Barnsley could face lifetime bans, the club said.
Counter-terrorism forces, backed by Shi'ite militias on the ground and coalition airstrikes, are moving into the city on several fronts.