submarine in late 2020. northumberland had been tracking the submarine in the arctic circle when it hit the ship's sonar equipment being trailed hundreds of metres behind it. it's not thought the contact was deliberate. the warship returned to port in scotland to repair the damaged equipment. let's get some of the day's other news argentina has registered over 100,000 coronavirus infections in 24 hours — its highest daily figure of the pandemic. 40 covid deaths were reported in the same period. cases have soared over the holiday period as the omicron variant spreads — with few restrictions in place. but with most argentines vaccinated, the authorities say hospital admissions are relatively low. thousands of people took to the streets in the sudanese capital, khartoum, on thursday to protest against military rule. security services fired tear gas at demonstrators near the presidential palace. it's the first organised protest since the resignation of the prime minister on sunday. supporters of the protest movement