Iran has once again closed its central and western airspace to international transit flights, just five days after reopening it. The move, announced Wednesday, follows a new security and safety assessment approved by the Civil Aviation Organization of Iran, according to Xinhua.

Flights to and from the country’s northern, southern, and western airports remain suspended until at least 14:00 local time (1030 GMT) Thursday. However, Iran’s eastern airspace, reopened on June 29, remains operational.

Iran initially shut its airspace on June 13 after Israeli airstrikes, later reaching a ceasefire with Israel on June 24 following 12 days of conflict, Xinhua reported.