An unidentified man threw a small explosive device at a U.S. Embassy in Montenegro early Thursday before killing himself with a separate device, Reuters reported.

Embassy officials say the man threw a small device, likely a hand grenade, near the compound. The device failed to cause any injuries or casualties, according to embassy staff, who say the man then committed suicide with a second explosive device.

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Reuters reports that embassy police armed with submachine guns were spotted patrolling the street after the attack, but that no major damage was reported.

“Immediately before, that person threw an explosive device from the intersection near the Sport Center into the U.S. embassy compound," read a tweet from Montenegro's government.

A note on the embassy's website urged Americans to avoid the compound on Thursday, advising residents of an active security situation.

“The U.S. embassy in Podgorica advises U.S. citizens there is an active security situation at the U.S. embassy in Podgorica,” the note read.

“Avoid large gatherings and demonstrations, and follow the instructions of local authorities,” the note from U.S. officials continued.

U.S. embassies have increasingly become a target for terrorist attacks in recent years.

In 2012, four Americans, including Ambassador to Libya Chris Stevens, were killed when the U.S. consulate in Benghazi, Libya, was attacked by militants.