Two small bombs went off in eastern Myanmar, killing one person and wounding at least six others, the latest in a series of unexplained explosions to hit the country, police said on Thursday.

The blasts in Namkham, on the northern tip of Shan state, occurred late on Wednesday and early on Thursday, said a duty officer at the local police station, asking to remain anonymous because he was not authorized to speak to the media.

An investigation is still under way, he said, adding no suspects have yet been named.

Myanmar has been rocked by at least nine small bombs in the last week, killing three people in attacks denounced by the U.S. Embassy as “acts of terror”.

“Acts of violence like those perpetrated and attempted over the past week have no place in civilized society,” a statement issued by the Embassy said.

The most high-profile attack was at the luxury Traders Hotel in the country’s main city of Yangon, which wounded a 43-year-old American woman.

The officer at the Namkham police station said one person had been killed and six others wounded in the Shan state blasts, none of them critically.

They appeared to be low-intensity explosions, causing little damage to nearby structures, he said, adding “they may have been time bombs, but we don’t know for sure”.

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