British Prime Minister Boris Johnson yesterday announced his intention to make terrorist offenses punishable by at least 14 years in jail after a knife attack that killed two people two days ago in London by a man convicted of terrorism. Prison with parole.

ISIS claimed responsibility for the attack by 28-year-old Briton Osman Khan, who was sentenced in 2012 for terrorist offenses and released from prison on parole six years later.

"This system must end - I repeat, this must stop. For all terrorist and extremist crimes, the punishment that the judge actually imposes on these criminals must be implemented," Johnson said in the midst of an election campaign for the early December 12 legislative elections. "They execute every day of their punishment without exception."

"If the accused is convicted of a serious terrorist offense, there should be a mandatory punishment of at least 14 years, and some of them should never be released from prison."

Osman Khan was sentenced to indefinite imprisonment in 2012, with a minimum of eight years, and his sentence became 16 years on appeal in 2013, for belonging to a group that wanted to blow up targets including the London Stock Exchange and set up a terrorist training camp in Pakistan.