Above is a nice photo of Iwo Jima taken from the waist window of a 7th Air Force Consolidated B-24J Liberator at the beginning of a bombing raid. I like this photo because it shows the location of Motoyama Airfield #1 (South Field) and Motoyama Airfield #2 (Central Field) on Iwo Jima.

7th Air Force B-24s started bombing Iwo Jima as soon as Saipan was secure and Isley Field was completed. On August 8, 1944, the 30th BG moved from Kwajalein Atoll in the Marshall Islands to Saipan, and two days later flew its first mission to bomb Motoyama Airfield #1. During the month of August, a total of 143 Liberators dropped 290 tons of bombs on Iwo Jima.

The Liberators had to go it alone as 7th Air Force only had Republic P-47D Thunderbolts, which did not have the range to accompany the B-24s on these long range bombing missions from Saipan to Iwo Jima and back. Notwithstanding, the 30th Bomb Group only lost two B-24 during the initial month of August.

References:

Strike and Return: American Air Power and the Fight for Iwo Jima, Cory Graff, Specialty Press (2006)