Canadian retaliatory tariffs on $20bn (C$28bn; £15bn) worth of US goods have taken effect, further jeopardising the world's largest bilateral trading relationship. The counter-tariffs will apply to steel, furniture and even cotton T-shirts and will be as high as 50%. The majority of Canadians support the retaliation, polls suggest, but economists warned that the latest in the tit-for-tat between the two neighbours will raise prices on everyday goods. Both the US and Canada have said they would like to strike a deal, but talks haven't resumed after they collapsed in August. Businesses on both sides are scrambling to deal with what comes next.

As students returned to al-Mughayyir boys school in the West Bank, they found the compound surrounded by barbed wire and ambulances outside. These changes were made to alleviate parents' fears after a surge in settler-related violence against Palestinians. In April, a 14-year-old was shot dead by a settler outside the school, and over summer two more pupils were killed by Israeli forces during settler attacks - Israel's army said its forces responded to instigators of "a violent riot". All West Bank settlements are illegal under international law, and Israel is under increasing international pressure, including from the UK which is expected to announce sanctions on settlements today.