An explosion – linked to a “tear gas test” – rocked the US Embassy in Myanmar sparking a lockdown.
US authorities are yet to comment on the incident, but social media reports suggest it was related to a training drill.
“Smoke and a foul smell” were reported during the incident earlier today.
A local officer Zaw Win told AFP that “it was not a bomb explosion”.
He said: “They were testing tear gas inside the practise grounds of their embassy. Gas came out onto the road in front of the embassy and some people smelled it and informed us.”
The officer said no one was injured and the gas did not cause any damage to the embassy.
The US Embassy has reportedly apologised for not informing police of the test in advance, he added.
Islamist terrorists have targeted US Government installations in Asia in recent years, and there are fears this explosion could be linked to extremists.