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The news comes just hours before Israel Prime Minister Benjamin Netanyahu is set to make a crucial televised announcement.

Israeli sources report that airspace has been closed over the Israel-Syria border, and over the Golan Heights in the northeast of the country.

Netanyahu's office has said the speech will include "dramatic news about Iran".

Local news is reporting that Israel's airspace in the north of the country will be closed to all civilian aircraft until at least the end of May.

(Image: AFP/GETTY IMAGES)

Iran's leaders have laughed off Israel's announcement.

The country's foreign minister Javad Zarif in a tweet accused Netanyahu of being: "The boy who can't stop crying wolf".

Today, Iran's Supreme Leader Ali Khamenei warned any strikes on his country's bases will be met with "firm force".

There are fears of tensions escalating in the region after 26 troops loyal to Syrian President Bashar al Assad were killed last night in military strikes.

(Image: TWITTER/ @JZARIF)

The strikes were so powerful that they reportedly triggered an earthquake.