The retaliatory strikes came on Saturday, a day after Israel killed top Iranian military leaders and scientists and destroyed an aboveground nuclear enrichment plant near Natanz.

Fresh explosions were reported in the Iranian capital of Tehran on Sunday afternoon local time after Iran's president warned of "more painful and crushing responses" to Israeli strikes. Israel launched the first of a series of airstrikes across Iran late on Thursday U.

Trump said he was working toward something "much bigger" than a ceasefire, while chastising Iran for not accepting his nuclear deal.