Strikes and counter-strikes between the U.S. and Iran intensified on Thursday, fueling fears the conflict could spread across the entire region. For the first time in five months, suspected military action expanded to Egypt with a drone strike that now marks a new front in the war. William Brangham reports.

Five months into the war between the US, Israel and Iran, the fighting hasn't stopped, it's just spread further out, and every side seems to be running low on something. This week…

The Middle East war is expanding after 5 months, with Iran going on the offensive and the U.S. and Saudi Arabia jointly striking Iranian proxy groups in Iraq.

Violence is escalating, but it also follows familiar trends.