A significant explosion in Tehran coincided with Iran's military actions against Gulf states, prompting U.S. President Trump's threats of retaliation. The escalating conflict raises concerns over regional stability and oil prices.

Loud blasts shook Tehran on Monday as the city again came under attack, with witnesses reporting that fighter jets could be heard overflying the Iranian capital, approaching from the north over the

The explosion was so loud and strong, the elderly resident of northern Tehran said she felt it in her heart, describing the U.S.-Israeli airstrikes that boomed across the Iranian capital and raised columns of smoke.

CNN's Frederik Pleitgen reports from Tehran on Sunday. Other videos from Tehran show the massive explosion and storm drains filled with burning oil consistent with reporting from Al Jazeera: "Iran oil facilities hit for first time as war with US-Israel enters day 9" Very Gates Of Hell looking video of the Tehran refinery burningNext on the list should be seizing Kharg Island Oil Terminal so they cannot sell a single barrel of oil to fund the IRGC's continued attempts to stay in charge of Iranpic.

The sky darkened over parts of Tehran on Sunday after the bombing of oil depots by Israel. Thick clouds of smoke rose over the capital.