About 30,000 protesters have launched a "people's coup" on Thailand's government, Reuters reports.
Prime Minister Yingluck Shinawatra was forced to flee a police compound after it was swarmed by protesters and multiple state agencies have been also been targeted.
Police fired teargas on protesters and troops are being sent to a government complex occupied by protesters since Thursday and the Finance Ministry, occupied since Monday.
"We have sent forces to these places to take back government property," national police spokesman Piya Utayo said on national television.
More top news
The RAF and Royal Navy were tasked with a 2,000-mile round trip to rescue a British cruise passenger bitten on the arm by a seal
Another unsettled day is forecast for the UK with strong winds and heavy bursts of rain.
Grant Shapps and Lord Feldman should stand down for their alleged inaction over bullying claims, father of activist who killed himself says.