Grieving family members of passengers aboard MH370 held an emotional gathering in Beijing on Monday, six months after the plane disappeared, demanding answers and accusing Chinese authorities of turning against them.

Chinese passengers account for about two-thirds of the 239 people aboard the Boeing 777, which vanished on March 8 en route from Kuala Lumpur to China's capital, with dozens of their relatives reportedly beaten and arrested in recent months.

About 30 family members convened on Beijing's Lama Temple, a popular Tibetan Buddhist site, to vent their frustration and pray for the missing on a day that marks both the six-month anniversary of the flight's disappearance as well as China's traditional Mid-Autumn Festival, a day for families to reunite.

"In China, today is Family Reunion Festival, Mid-Autumn Festival," said a 55-year-old woman who gave only her surname, Zhang, and whose daughter was aboard the flight.

"Every day is torture, but today we're suffering even more," added Zhang, who is from the far northeastern city of Harbin but has been staying in Beijing since the plane's disappearance.

"I'm calling on the kind people of the world to hurry up and rescue my child," said another woman, who declined to give her name. "Rescue my child. We can't live on."

Australia has been spearheading the hunt for the plane, which is believed to have crashed in the southern Indian Ocean.

But the massive air, sea and underwater search has so far failed to find any wreckage.

An intensified search will start in about two weeks, focusing on a dauntingly vast stretch of ocean measuring 60,000 square kilometres (23,000 square miles).

- Harassment -

As plainclothes and uniformed police looked on in Beijing, several family members related stories of harassment by Chinese authorities, such as one episode earlier this summer when more than a dozen family members were arrested -- including children aged six and four -- and some beaten after seeking answers from the Malaysia Airlines office in the capital.

Dai Shuqin, a 61-year-old worker from Beijing whose younger sister and her family were aboard MH370, said she was among those who had been detained.

"We don't understand it; we're just ordinary people," she said.

"Some of us want to take our own lives -- climb up a tall building and kill ourselves," she whispered. "We're being bullied so much. Our country is not protecting us at all. How can we live?"

The mistreatment represents a sharp turnaround by Chinese authorities, who initially voiced support for the relatives and even granted rare permission for them to hold demonstrations outside the Malaysian embassy.

Upon arriving at the Lama Temple, several of the relatives burst out in anger at their treatment and the lack of answers, with some continuing to espouse conspiracy theories about the plane's whereabouts.

"I think this case is strange," said a man surnamed Zhen, the brother of a missing passenger. "Technology and information is already very developed. Half a year has gone by and absolutely no news. It's really hard to accept."

Later, the family members gathered on benches to eat steamed buns and fruit, while nearby temple visitors burned incense at giant cauldrons. Some had donned blue-and-white T-shirts reading "MH370, return home safely", which they had worn to earlier demonstrations. Several rested their heads in their hands, distraught.

"At the very least, this kind of thing shouldn't happen," Zhang said when asked about the abuse at the hands of authorities. "We relatives are all suffering. They shouldn't make us suffer even more."

- 'We are in limbo' -

Meanwhile in Malaysia, Selamat Umar, 60, whose son Mohamad Khairul Amri was onboard the ill-fated airliner, said he held special prayers attended by about 100 people Sunday for "Allah to protect my son and bring him back".

"It is breaking my heart that we still do not have any information about MH370," he said. "There is no peace of mind for me at all."

Jacquita Gonzales, 52, the wife of inflight supervisor Patrick Gomes, said it was "daily torture for us not knowing where they are".

"Six months on we are no closer to the truth, we are no closer to any closure. We are in limbo," she said.