Trump confirms US has launched 'major combat operations' in Iran, as explosions reported in Tehran

US President Donald Trump confirms US has launched "major combat operations" in Iran
It comes after Israeli Defence Minister Israel Katz says his country has launched a "pre-emptive" attack on Iran
The BBC has received images of smoke rising in Tehran, as Iranian state media report further explosions in the east and north of the country's capital city
Katz has also announced a state of emergency in Israel in anticipation of retaliatory strikes