Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames, to mark London International Shipping Week in London, Thursday, Sept. 12, 2019. The British government insisted Thursday that its forecast of food and medicine shortages, gridlock at ports and riots in the streets after a no-deal Brexit is an avoidable worst-case scenario, as Prime Minister Boris Johnson denied misleading Queen Elizabeth II about his reasons for suspending Parliament just weeks before the country is due to leave the European Union. (Daniel Leal-Olivas/Pool photo via AP)
Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames, to mark London International Shipping Week in London, Thursday, Sept. 12, 2019. The British government insisted Thursday that its forecast of food and medicine shortages, gridlock at ports and riots in the streets after a no-deal Brexit is an avoidable worst-case scenario, as Prime Minister Boris Johnson denied misleading Queen Elizabeth II about his reasons for suspending Parliament just weeks before the country is due to leave the European Union. (Daniel Leal-Olivas/Pool photo via AP) Credit: Daniel Leal-Olivas

LONDON — The British government insisted Thursday that its forecast of food and medicine shortages, gridlock at ports and riots in the streets after a no-deal Brexit is an avoidable worst-case scenario, as Prime Minister Boris Johnson denied misleading Queen Elizabeth II about his reasons for suspending Parliament just weeks before the country is due to leave the European Union.

This week, Parliament forced the government to publish its official assessment of the impact of leaving the EU without a withdrawal agreement.

The six-page classified document, dated Aug. 2, said customs checks meant the number of trucks crossing the main freight route between Calais and Dover would drop by between 40% and 60% within a day of a no-deal Brexit, with disruptions lasting up to three months. The supply of certain types of fresh foods and essential medicines would decrease, prices would go up and the poor would be hit hardest, it said.

The paper also described major disruptions for travelers between Britain and the EU and uncertainty for U.K. citizens living in Europe, and it said attempts to maintain an open border between Ireland and Northern Ireland would probably fail. It also said a no-deal exit could trigger major protests and even riots.

Johnson insisted the bleak scenario was “not where we intend to end up.”