Israel struck an installation at Iran’s South Pars gas field on Saturday, the first attack on Iran’s oil and gas sector as part of what the Israeli government had warned would be a prolonged operation to prevent Tehran from building an atomic weapon.

Iran has partially suspended gas production from the South Pars field, Iran’s portion of the world’s largest natural gas reserve, which lies beneath the Gulf and is shared with major gas exporter Qatar. 

Israel also struck a Tehran fuel depot and an oil refinery near the capital on Saturday, Iran said, but authorities said the situation was under control. 

Following are some facts on the country’s energy industry, exports, and the impact of previous Western sanctions.