Nigeria, Nov. 4 -- A giant billboard threatening US President Donald Trump has been unveiled in Tehran, Iran, alongside other banners carrying similar messages across the country's capital.

The billboard, displayed at Enghelab Square on Tuesday, depicts Trump behind bars with his head bowed and carries a message threatening to kill him.

The display marks a further escalation in anti-Trump rhetoric in Tehran, where billboards mocking the US president and calling for revenge have become increasingly common since the war began on February 28.

The conflict began with US-Israeli strikes that killed Iran's Supreme Leader, Ayatollah Ali Khamenei. The latest displays emerged amid renewed diplomatic efforts to bring Tehran and Washington to th...