It's a message to Iran. Amos Harel:

What does Iran learn from all this? That Israel possesses exceptional intelligence, a willingness to take great risk, and an ability to act successfully against targets far from Israel's borders. Yet Iran knew all this after the previous strikes. If the reports are true, the bombing in Sudan was an important message of deterrence from Israel to Iran, yet the road from Sudan to the destruction of Iran's nuclear program is a long one. As such, a quartet of F-15 fighter jets is insufficient. A large number of planes taking part in wave after wave of bombing sorties against numerous targets - most of them ensconced deep underground - is required.

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