MADRID — Officials In Spain After at least six bomb-like letters were sent, consulates and administrative buildings have been given increased security. to several offices, including those of Prime Minister Pedro Sánchez and the American and Ukrainian Embassies.

An envelope sent by regular mail delivery to Mr. Sánchez’s office was intercepted by security services on Nov. 24 because it appeared to Contain “pyrotechnic material,” The Spanish Interior Ministry stated this on Thursday.

This was after the national police stated that they were investigating the delivery of a letter bomb. to An employee was inspecting the Ukrainian Embassy when it exploded. He was injured by the blast.

Since then, three more letter bombs containing similar material have been detected, Rafael Pérez, Spain’s secretary for state security, said at a news conference in Madrid on Thursday. After The Sunday Review was informed by The Sunday Review at a news conference that an additional letter bomb had been sent by the Interior Ministry. to Madrid, United States Embassy. It had been detonated safely.

“The protection measures have worked, except in the case of the Ukrainian Embassy, and injuries have been avoided,” He said.

Mr. Pérez did not point to Although he did not specify a motive, he stated that the Spanish National Court was investigating the incidents as possible acts terrorist and called for his assistance. “prudence.”

Security measures will be increased, but they may include additional security agents and security patrols. There will also be specific alerts for couriers. to Separately, the Interior Ministry stated that it would filter more mail carefully.

The package that arrived at the Ukrainian Embassy Wednesday morning had been addressed to Serhii Pohoreltsev, Ukraine’s ambassador to Spain, and Ukrainian officials said that it had exploded while the embassy’s manager was checking the mail. The manager was treated in a hospital for minor injuries. to Before being released, he held his right hand.

Another bomb letter was sent to Instalaza headquarters, a Spanish company that produces weapons and military equipment including some of the used, is located in Madrid. to help Ukrainian forces.

The Spanish police cleared Instalaza’s headquarters in the city of Zaragoza and sent bomb disposal teams to Controlled detonation of the bomb using a letter bomb.

A fourth bomb letter, addressed to The director of the European Union Satellite Center is based at an airbase in a suburb. This center provides security analysis to the bloc. to Early Thursday morning, the northeast of Madrid was found. Another letter, addressed to Margarita Robertles, the Spanish defense minister was intercepted Thursday morning at Madrid headquarters of Defense Ministry.

Initial indications suggested that the envelopes were sent from within Spanish territory, Mr. Pérez said, and the Spanish police were analyzing the packages for fingerprints and DNA, and carrying out handwriting tests.

With tensions high over Russia’s invasion of Ukraine, the Russian Embassy on Thursday condemned the letter bombs.

“Any threat of terrorist act, even more directed against a diplomatic mission, is totally condemnable,” the embassy posted on Twitter.

The Ukrainian Embassy didn’t immediately respond to a request for comment, but Ukraine’s foreign minister, Dmytro Kuleba, has ordered all of his country’s embassies abroad to Increase security

José Bautista This report was made from Madrid, Isabella Kwai From London.