Albania has suffered another cyberattack, the country’s interior ministry said on Saturday, blaming Iran, which Tirana also accused of a previous attack on its digital systems.

“The national police’s computer systems were hit by a cyberattack on Friday, which initial reports indicate was carried out by the same actors who attacked the country’s public and government service systems in July,” the ministry said in a statement.

“In order to neutralize the criminal activity and secure the systems,” the authorities shut down computer control systems at seaports, airports and border posts, the statement said.

In a tweet, Prime Minister Edi Rama denounced “another cyberattack (perpetrated by) the same attackers already condemned by Albania’s friendly countries and allies.”

Albania blamed Iran for the July attack and on Wednesday severed diplomatic ties over the affair.

The two countries have been bitter enemies for years, since the Balkan state began welcoming members of the opposition People’s Mujahideen of Iran, or Mujahedeen-e-Khalq (MEK), onto its soil.

Rama on Wednesday accused Iran of directing a July 15 cyberattack on Albanian institutions to “cripple public services and hack data and electronic communications from government systems.”

It was the first time Tirana spoke about the alleged attack.

“The Council of Ministers has decided to sever diplomatic relations with the Islamic Republic of Iran with immediate effect,” Rama said.

“The attack in question failed in its purpose. The damage can be considered minimal compared to the attacker’s goals. All systems were fully functional again and there was no irreversible deletion of data.”

The prime minister said Iranian diplomats and embassy staff have 24 hours to leave the country.

Iran dismissed accusations of being behind the cyber attack as “baseless” and called Albania’s decision to sever diplomatic ties “a rash and short-sighted act”.

“Iran, as one of the target countries of cyberattacks on its critical infrastructure, rejects and condemns any use of cyberspace as a tool to attack the critical infrastructure of other countries,” its foreign ministry said.

The US on Friday announced sanctions against Iran’s intelligence and security ministry and its minister, Esmail Khatib, over alleged Tehran involvement.

The Islamic Republic has also been the target of cyberattacks, most notably in 2010 when the Stuxnet virus — believed to have been developed by Israel and the US — infected its nuclear program.

Albania agreed to accept members of the MEK in 2013 at the request of Washington and the United Nations, with thousands settling in the Balkan country over the years.

After the collapse of its communist government in the early 1990s, Albania has emerged as a staunch ally of the United States and the West, formally joining NATO in 2009.

The MEK backed Ayatollah Ruhollah Khomeini in the 1979 revolution that ousted the Shah but quickly fell out with the new Islamic authorities and launched a decades-long campaign to overthrow the regime.

The MEK regularly hosts summits in Albania, which have long garnered support from conservative US Republicans, including former Vice President Mike Pence, who delivered a keynote address at an event in June.

A month later, the group postponed another summit, citing unspecified security threats targeting the event.