“Order coffins for your soldiers,” wrote an Iranian Twitter user underneath U.S. President Donald Trump’s tweet in the wee hours of Friday as news about the killing of Iran’s top military commander sent shockwaves across the region.

A U.S airstrike killed Gen. Qasem Soleimani, the head of Iran’s elite Quds Force, and Abu Mahdi al-Muhandis, a senior commander of Iraq’s Hashd al-Shaabi or Popular Mobilization Units (PMU).

The U.S. said it killed Soleimani because he “was actively developing plans to attack American diplomats and service members in Iraq and throughout the region”.

Read more: Top general's killing puts US, Iran on collision course