Thai well-wishers pray and wishing health recovery for Thai King Bhumibol Adulyadej at Siriraj Hospital in Bangkok, Thailand, 12 October 2016.

Thai King Bhumibol Adulyadej remains in unstable condition at a Bangkok hospital where he is on a ventilator while being treated for liver problems and a blood infection, the royal palace said in a statement Wednesday.

There is growing concern over the health of the 88-year-old king, who has been on the throne since 1946 and is the world's longest-reigning monarch.

Doctors will continue to treat Bhumibol with continuous renal replacement therapy, a common treatment for patients with acute kidney injuries, the palace said.

Earlier Wednesday, members of the royal family including Crown Prince Mahavajiralongkorn paid a visit to the king at Siriraj hospital in Bangkok, local media reported.

The announcement - the third on the king's health in two weeks - has raised anxiety over the royal succession in military-ruled Thailand.

Hundreds of well-wishers flock to the hospital in pink T-shirts signifying good health and yellow T-shirts, the king's colour.

Bhumibol is revered in Thailand, where he is seen as a unifying figure.

Thai stocks plunged since the start of the week, with trading in the red throughout on Wednesday, closing with a 2.5 per cent drop.

Many Thais have gathered at temples to pray for his recovery, while posts with the hashtag #longlivetheking have flooded social media.

Bhumibol spent a majority of the past decade in hospital. His last public appearance was on January 11, when he was seen meeting with hospital staff.

Related stories

Latest news

Croatian MEP says Moscow wants to influence in western Balkans

Croatian MEP Ivan Jakovcic said in an interview with the Montenegrin Pobjeda daily on Thursday that Moscow is trying to exploit the political forces in Montenegro and that Russia's meddling in Montenegro's internal affairs was "unacceptable behaviour."

New York Times launches brand campaign for "The Truth" with Oscars ad

The New York Times is using Sunday's Academy Awards show to launch an advertising drive with an ad spot that capitalizes on President Donald Trump's confrontational relationship with the paper and other mainstream media.

Gambia charges former spy chief with murder of opposition leader

The former head of the Gambian national intelligence agency has been charged with the murder of an opposition youth leader who died in detention last year.

Dutch populist Wilders won't publicly campaign after security fiasco

The Dutch Party for Freedom (PVV) won't make public appearances in support of its election campaign after a security official assigned to protect party founder Geert Wilders was detained by police.

Peace Implementation Council Steering Board calls for defusing tensions in Bosnia

The Steering Board of the Peace Implementation Council in Bosnia and Herzegovina (BiH) met on Thursday, expressing the international community's concern about the situation in the country and calling on local politicians to act rationally to prevent an escalation of the crisis after a motion was submitted to review an International Court of Justice (ICJ) ruling in BiH's case against Serbia for genocide.

Trump blasts Mexico as top diplomat holds talks in Mexico City

US President Donald Trump expressed ambivalence about the US relationship with Mexico as he blasted the country Thursday for what he claims is an unfair trade relationship.

Croat accused of rioting at UEFA 2016 game goes on trial

The trial of Ivan Vucenovic, 21, accused of causing rioting during a European soccer championship match between Croatia and the Czech Republic in Saint Etienne, France last June, began at the Sibenik Municipal Court on Thursday.

Schools blocked, 26 arrests in Paris protests against police abuses

Hundreds of young people took to the streets of Paris on Thursday in protests against alleged police brutality, with local media reporting that 16 secondary schools were forced to shut.

Aid agency: 13 dead among dozens trapped in Libya container

The bodies of 13 migrants were found along with dozens of survivors trapped inside a transport container in Libya's western town of Khoms, an aid agency said Thursday.

Strike grounds hundreds of Alitalia flights

Employees of loss-making Italian airline Alitalia walked off the job Thursday after government-mediated talks failed to break the deadlock, causing the airline to cancel hundreds of flights.

Bosnia requests review of ICJ judgement that exonerating Serbia

Bosnia and Herzegovina's legal counsel Sakib Softic on Thursday submitted a request to the International Court of Justice (ICJ) in The Hague, for a review of a judgement in the genocide suit against Serbia.

Frljic: Warsaw play big hit, ascribes criticism to conservative repression

The media have reported that Polish prosecutors on Wednesday began investigating Frljic's play, which the Catholic Church and the conservative community in Poland have called "blasphemous".