US Secretary of State John Kerry said there was "no justification" for the military coup in Thailand.
"This act will have negative implications for the US-Thai relationship, especially for our relationship with the Thai military," Kerry said in a statement.
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Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
New research has found those who consumed two cups had a 35% reduced risk, and for those who drank five cups, the risk halved.