Israel will receive a "devastating and decisive response" if it attacks Iran, Tehran's Revolutionary Guards said on Thursday, days after CNN reported U.S. intelligence suggesting Israel was making preparations to strike Iranian nuclear facilities.

After 19 months of pounding Gaza, Israel is now under growing pressure from unlikely quarters – some of its closest Western allies.

European and UK officials ratcheted up pressure on Israel over its latest offensive in Gaza, expanding the international outcry over the humanitarian crisis caused by the conflict.

Israel is set to allow aid into the Gaza Strip for the first time in months following increased pressure from the nation's allies to prevent Palestinians from buckling under the weight of famine altogether.

International pressure is mounting on Israel amid its renewed military operation in the Gaza strip, as both the United Kingdom and the European Union announced measures to distance themselves from the country on Tuesday.

The Israeli military says troops fired warning shots into the air but not at Palestinians during Tuesday's incident in Rafah.