The Islamic Republic will launch its satellite-carrying Zuljanah rocket twice more after conducting a previous launch, the state-run IRNA news agency quoted Defense Ministry spokesman Ahmad Hosseini as saying. He did not elaborate on a timeframe for the tests, nor said when the previous launch occurred.

Each of the Zuljanah’s three stages will be evaluated during the tests, Hosseini said.

Satellite images taken Tuesday by Maxar Technologies showed preparations at a launch pad at Imam Khomeini Spaceport in Iran’s rural Semnan province, the site of frequent recent failed attempts to put a satellite into orbit.

One set of images showed a rocket on a transporter, preparing to be lifted and put on a launch tower. A later image Tuesday afternoon showed the rocket apparently on the tower.

Though it isn’t clear when the launch will take place, erecting a rocket typically means a launch is imminent. NASA fire satellites, which detect flashes of light from space, did not immediately see any activity over the site late Tuesday night into Wednesday.

Asked about the preparations, State Department spokesman Ned Price told reporters in Washington that the US urges Iran to de-escalate the situation.

“Iran has consistently chosen to escalate tensions. It is Iran that has consistently chosen to take provocative actions,” Price said.

A Pentagon spokesman, US Army Maj. Rob Lodewick, said the American military “will continue to closely monitor Iran’s pursuit of viable space launch technology and how it may relate to advancements in its overall ballistic missile program.”

“Iranian aggression, to include the demonstrated threat posed by its various missile programs, continues to be a top concern for our forces in the region,” Lodewick said.

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

The program has seen recent troubles, however. There have been five failed launches in a row for the Simorgh program, a type of satellite-carrying rocket.

A fire at the Imam Khomeini Spaceport in February 2019 also killed three researchers, authorities said at the time.

The launch pad used in Tuesday’s preparations remains scarred from an explosion in August 2019 that even drew the attention of then-President Donald Trump.

He later tweeted what appeared to be a classified surveillance image of the launch failure. Satellite images from February suggested a failed Zuljanah launch earlier this year, though Iran did not acknowledge it.

The successive failures raised suspicion of outside interference in Iran’s program, something Trump himself hinted at by tweeting at the time that the US “was not involved in the catastrophic accident.”

There’s been no evidence offered, however, to show foul play in any of the failures, and space launches remain challenging even for the world’s most successful programs.

Meanwhile, Iran’s Revolutionary Guard (IRGC) in April 2020 revealed its own secret space program by successfully launching a satellite into orbit. The IRGC launched another satellite this March at another site in Semnan province, just east of the Iranian capital of Tehran.

John Krzyzaniak, a research associate at the International Institute for Strategic Studies, had predicted Tuesday that Iran would test another Zuljanah. Krzyzaniak earlier this week suggested a launch was imminent based on activity at the site.

Iranian state television aired footage of a successful Zuljanah launch in February 2021.

The launch preparations also come as the Guard reportedly saw one of its soldiers “martyred” in Semnan province under unclear circumstances over the weekend. Iran’s Defense and Armed Forces Logistics Ministry, however, later claimed the man worked for it. The Zuljanah was designed by that ministry.

The United States has alleged that Iran’s satellite launches defy a UN Security Council resolution and has called on Tehran to undertake no activity related to ballistic missiles capable of delivering nuclear weapons. The US intelligence community’s 2022 threat assessment, published in March, claims such a satellite launch vehicle “shortens the timeline” to an intercontinental ballistic missile for Iran as it uses “similar technologies.”

Iran, which has long said it does not seek nuclear weapons, previously maintained that its satellite launches and rocket tests do not have a military component. US intelligence agencies and the International Atomic Energy Agency say Iran abandoned an organized military nuclear program in 2003.

However, Iran’s likely preparations for a launch come as tensions have been heightened in recent days over Tehran’s nuclear program. Iran now says it will remove 27 IAEA surveillance cameras from its nuclear sites as it now enriches uranium closer than ever to weapons-grade levels.

Both Iran and the US insist they are willing to re-enter Tehran’s 2015 nuclear deal with world powers, which saw the Islamic Republic drastically curb its enrichment in exchange for the lifting of economic sanctions.

Trump unilaterally withdrew America from the accord in 2018, setting in motion a series of attacks and confrontations beginning in 2019 that continue today into the administration of President Joe Biden.

Talks in Vienna about reviving the deal have been on a “pause” since March.

Building a nuclear bomb would still take Iran more time if it pursued a weapon, analysts say, though they warn Tehran’s advances make the program more dangerous. Israel has threatened in the past that it would carry out a preemptive strike to stop Iran — and already is suspected in a series of recent killings targeting Iranian officials.