Iran has threatened to strike the energy and water systems of its Gulf neighbours if U.S. President Donald Trump does not fully reopen the Strait of Hormuz within 48 hours. This could escalate the three-week-old war and exacerbate global markets. The Israeli military also announced it was striking Tehran in response. While attacks on electricity could harm Iran, they could be catastrophic for its Gulf neighbors, who consume five times as much power per capita. The threat comes as the U.K. and Israel are sending troops to the region. The three-hour war has resulted in over 2,000 deaths and caused severe market disruption, with oil prices rising to their highest in nearly four years.