Sources said mediators have set up communication channels to reduce the risk of escalation from any incidents, and technical talks between the US and Iran will continue.

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Andy Burnham will deliver an economic-plan speech on Monday. Burnham re-entered Parliament and won a seat this month; he is the only formal candidate for prime minister and could take Downing Street in coming weeks. Investors will focus on his economic-policy stance; gilt investors, more than FX markets, are watching how he would drive growth. Markets broadly expect a tilt toward expansionary fiscal policy, but fiscal space is limited and the government's capacity to raise new borrowing is constrained, leaving little room for additional spending. There are market concerns about a repeat of the Truss crisis. Analysts say Burnham's choice for Chancellor of the Exchequer will be a key determinant of whether UK financing costs remain stable.