Estonia's defense minister has ordered a halt to NATO air exercises in Estonia pending an investigation after a missile was accidentally fired over the Baltic country's airspace by a Spanish fighter jet on a military exercise this week.

Minister Juri Luik said Thursday at a news conference in Tallinn that the air-to-air missile that was erroneously launched Tuesday over southern Estonia has not been found but no people were reported injured or killed in the misfiring.

"The Spanish defense minister has apologized and expressed deep regret," Luik said, adding that the commander of the Spanish Armed Forces has apologized as well.

Estonian Prime Minister Juri Ratas spoke with NATO Secretary-General Jens Stoltenberg on Wednesday, expressing Estonia's concern over the "serious incident."

The AMRAAM-type missile has a range of up to 100 kilometers (62 miles). It may have crashed into a remote nature reserve in the eastern Jogeva region not far from Estonia's border with Russia or triggered its built-in self-destruct mode and exploded in midair, Luik said.

The Eurofighter Typhoon of the Spanish Air Force was part of NATO's Baltic air-policing mission based in Lithuania and was carrying air-to-air missiles containing up to 10 kilograms (22 pounds) of explosives.

While Luik urged Spain to conduct a thorough investigation, he also launched a separate internal probe to review the safety regulations of arranging military air exercises in the tiny NATO nation of 1.3 million.

Until the completion of that review Luik said "I have suspended all NATO exercises in the Estonian airspace."

He still reiterated Estonia's trust in NATO's Baltic air mission, which started in 2004 as Estonia, Latvia and Lithuania joined the military alliance. The three small former Soviet republics don't posses fighter jets of their own.

The air policing is carried out from NATO's bases in Siauliai, Lithuania, and Amari, Estonia. French, Portuguese and Spanish fighter jets are currently in charge of the rotating four-month mission.

In Moscow, Russian Foreign Ministry spokeswoman Maria Zakharova said Thursday the Estonian missile incident and NATO's air drills are security risks for the region.

"What happened is yet another vivid demonstration of the fact that NATO's actions, including in the Baltic states, pose extra risks to security rather than improving it," Zakharova told reporters.