One of the six packages containing “pyrotechnic material” was also sent to the prime minister’s office in Madrid, prompting the authorities to increase security.
MADRID — Officials in Spain have increased security measures at consulates and public administrative buildings in the country after at least six letter bombs were mailed 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 said on Thursday.
That came after the national police said that they were investigating a letter bomb delivered to the Ukrainian Embassy that exploded on Wednesday, injuring the finger of an employee who had been inspecting it.
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.
“The protection measures have worked, except in the case of the Ukrainian Embassy, and injuries have been avoided,” Mr. Pérez said during the conference.
Mr. Pérez did not point to a specific motive, but he said that the Spanish National Court on Thursday was investigating the incidents as possible acts of terrorism and called for “prudence.”
After the news conference, a spokesperson for the Interior Ministry said in text messages that another letter bomb had been sent to the U.S. Embassy in Madrid and that it had been safely detonated.
The State of the War
- A Pivotal Point: Ukraine is on the offensive, but with about one-fifth of its territory still occupied by Russian forces, there is still a long way to go, and the onset of winter will bring new difficulties.
- Ukraine’s Electric Grid: As many Ukrainians head into winter without power or water, Western officials say that rebuilding Ukraine’s battered energy infrastructure needs to be considered a second front in the war.
- A Bloody Vortex : Even as they have celebrated successes elsewhere, Ukrainian forces in the small eastern city of Bakhmut have endured relentless Russian attacks. And the struggle to hold it is only intensifying.
- Dnipro River: A volunteer Ukrainian special forces team has been conducting secret raids under the cover of darkness, traveling across the strategic waterway that has become the dividing line of the southern front.
The U.S. Embassy confirmed that a suspicious package had been received there and that they were aware of reports of other packages being sent elsewhere in Spain. “We thank the Spanish law enforcement for their help during this situation,” the embassy said in a statement.
The increased security measures will vary but include more security patrols and agents, and specific alerts for couriers to more carefully filter mail, the Interior Ministry said in a separate statement.
The package that arrived in the Ukrainian Embassy on Wednesday 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 at a hospital for a minor injury to his right hand before being released.
Another letter bomb was sent to the headquarters of Instalaza, a Spanish firm that manufactures weapons and military equipment, including some used to help Ukrainian forces.
The Spanish police cleared Instalaza’s headquarters in the city of Zaragoza and sent bomb disposal teams to perform a controlled detonation of the letter bomb.
A fourth letter bomb, addressed to the director of the European Union Satellite Center, which provides security analysis for the bloc and is housed at an air base near a suburb to the northeast of Madrid, was detected early Thursday. Another letter, addressed to the Spanish defense minister, Margarita Robles, was intercepted Thursday morning at the Madrid headquarters of the 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.
Weapons of this type are not new.
Often called parcel bombs, letter bombs or package bombs, they are all improvised explosive devices designed to look innocuous from the outside and to maim or kill whoever opens them.
Typically small in size, such improvised bombs usually contain no more than a couple of pounds of explosives — which, if detonated within arms’ reach, can be lethal.
The targets in the Spain attacks are either connected to Ukraine or have expressed support for the country in its war effort against Russia, but Ignacio Torreblanca, director of the Madrid office of the European Council on Foreign Relations, cast doubt on the idea that Moscow was behind the attacks.
If Russia, were involved, he said, he would have expected the country not to hide its role, although he acknowledged, “of course, we cannot know what is going on.”
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 did not immediately respond to a request for comment, but Ukraine’s foreign minister, Dmytro Kuleba, has ordered all of his country’s embassies abroad to bolster security.
In the United States, perhaps the most infamous bombing campaign using these types of weapons was carried out by Theodore J. Kaczynski, who was known only as the Unabomber until his arrest by the F.B.I. in 1996. In 1998, Mr. Kaczynski pleaded guilty to killing three people and wounding 28 more with homemade bombs over 18 years, and is serving a life sentence with no possibility of parole.
The United States has developed significantly more effective means of analyzing the remains of such devices since then as a result of the post-9/11 wars, in which improvised bombs became a primary weapon of insurgents in Iraq, Afghanistan and other countries. Federal law enforcement and the Defense Department maintain mobile laboratories that can be flown to analyze the remains of such weapons and look for clues that can be used to identify their makers.
José Bautista reported from Madrid, Isabella Kwai from London, and John Ismay from Washington.