Allegations vs Evidence

Saw this in a Washington Post article:

The recent report by the International Atomic Energy Agency alleges Iran has been seeking to acquire equipment and weapons design information, testing high explosives and detonators and developing computer models of a warhead’s core. It is the strongest evidence yet that the Iranian program ranges far beyond enriching uranium for use in energy and medical research, as Iran’s government insists.

Since when does an ‘allegation’ constitute ‘evidence’? This really is appalling and yet so typical of the mainstream media.