The US and UK are reducing some troops at the Al-Udeid air base in Qatar. This comes as US President Donald Trump considers action against Iran due to its harsh crackdown on anti-government protests. Officials told CBS that the partial pullback is a "precautionary measure." The BBC reports the UK is also removing some military staff. A statement from Qatar said these steps reflect "current regional tensions." Trump warned the US would take "very strong action" if Iran executes protesters. Iran has promised to retaliate if attacked. Human rights groups say over 2,400 protesters have died in Iran's recent crackdown. Qatar said it will keep protecting its citizens and key military sites. The Al-Udeid base is the biggest US base in the Middle East, housing about 10,000 US and 100 UK personnel. The exact number of those leaving is unclear. The UK Ministry of Defence declined to comment, citing "operational security." Reuters said some diplomats saw no immediate signs of a large troop withdrawal like before last year's Iranian strike. An adviser to Iran's Supreme Leader, Ali Shamkhani, warned Trump that Iran’s past attacks show their "will and capability to respond." Meanwhile, the US Mission in Saudi Arabia urged people to "exercise increased caution" near military sites in the region. Trump criticized Iran on social media, saying Iranian leaders want to negotiate but the US "may have to act before a meeting." Iran accused the US of trying to "manufacture a pretext for military intervention." Iran’s parliament said US and Israeli military and shipping centers in the region would become "legitimate targets" if attacked. The protests in Iran began in late December over currency collapse and rising costs. They grew into major calls for political changes. The Human Rights Activists News Agency confirmed 2,403 protesters killed and over 18,434 arrested, despite internet blackouts.