Nigeria, Feb. 28 -- President Donald Trump has warned that some Americans would be killed in the war his country has just started with Iran.

"The Iranian regime seeks to kill. The lives of courageous American heroes may be lost, and we may have casualties - that often happens in war - but we're doing this not for now. We're doing this for the future, and it is a noble mission," the American leader said in a video broadcast after the US and Israel launched attacks on Iran.

He also indicated that his aim was to achieve a change in government in Iran.

"When we are finished, take over your government. It will be yours to take. This will be probably your only chance for generations," the president said, in reference to protesters in Iran wh...