The killing of Iranian Major General Qassem Soleimani by the US has the world talking. Here's what you need to know.

The assassination of Iranian Major General Soleimani by the US military has relations between Washington and Tehran hitting a new low.

US President Donald Trump says the assassination was necessary to prevent an imminent threat but Iran's leaders and allies say the killing represents an act of war.

Was the attack legal? And how will Iran respond? Start Here tackles the big questions.

Source: Al Jazeera