Iran says it has postponed its plan to send human to space because of technical and financial challenges.

"Iran planned to send humans into space using bio-capsules as part of its space program by the year 1404 (starting in mid-March), but the plan has been delayed due to technological challenges and issues in securing funding for the project," said Iran's Space Organization chief Hassan Salarieh.

Western countries have long accused Iran of exploiting its space program to test technologies that can be repurposed for military use, specifically long-range ballistic missiles capable of carrying nuclear warheads. Despite numerous UN resolutions calling for a halt to these activities, Tehran has pressed ahead, raising alarms across the globe.

Iran has launched several short-lived satellites into orbit over the past decade and, in 2013, sent a monkey into space.