Israel and Iran's air war entered a second week on Friday and European officials sought to draw Tehran back to the negotiating table after President Donald Trump said any decision on potential U.S. involvement would be made within two weeks, Reuters reported.

Israel began attacking Iran last Friday, saying it aimed to prevent its longtime enemy from developing nuclear weapons. Iran retaliated with missile and drone strikes on Israel. It says its nuclear programme is peaceful.

Israeli air attacks have killed 639 people in Iran, said the Human Rights Activists News Agency. Those killed include the military's top echelon and nuclear scientists. Israel has said at least two dozen Israeli civilians have died in Iranian missile attacks. Reuters could not independently verify the death toll from either side.

Israel has targeted nuclear sites and missile capabilities, but also has sought to shatter the government of Supreme Leader Ayatollah Ali Khamenei, according to Western and regional officials, according to Reuters.