More bombings rocked Myanmar on Thursday, killing at least one and injuring six.
A first explosion hit late Wednesday night, causing no injuries, and was followed by Thursday's twin bombs in Namkham, a town in Shan state that borders China.
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The US Embassy in Yangon on Thursday said the bombings "have no place in civilized society."
A police officer, on condition of anonymity, said the explosive devices found by security officials were considered crude.
"I don't know if there's any connection between these latest blasts and the incidents in Yangon and Mandalay," another police official in the capital, Naypyitaw, told Reuters on condition of anonymity.
Thursday's explosions were the latest in a series of bombings in Myanmar.
The luxury Traders Hotel was the target of a homemade explosive device in Yangon late on Monday. The bomb injured an American woman, leading the US Embassy in Yangon to issue a travel advisory on Tuesday.
Police arrested a 27-year-old suspect early Tuesday who had previously stayed in the room at Traders where the explosion originated.
A further suspect is still being sought in connection with another blast that hit a guesthouse in the town of Taunggu last Friday.
No one has yet claimed responsibility for the string of explosions and police have not said whether they are connected.