Sitting in a small courtyard in Goma, eastern DR Congo, a 55-year-old Tutsi woman joked darkly that she would be killed if she spoke under her real name. 

She fled to the city last week after a militia leader known as General Janvier, an opponent of the Tutsi-led M23 rebel group, arrived in her town of Kitschanga.

"We saw children with machetes and guns saying they'd come to kill the Tutsis," said the woman, in a poor Goma neighbourhood of clapboard houses on the Rwandan border. 

The M23 has advanced across North Kivu province in recent weeks, winning victories over the army as well as other militias and forcing hundreds of thousands to flee in its wake.

The Democratic Republic of Congo accuses its smaller neighbour Rwanda of backing the M23, something UN experts and US officials agree with -- although Kigali denies it.

Knife-edge tensions have escalated pressure on Congolese Tutsis, whose history is contested in the central African nation. 

Many assume that Tutsis support the M23, for example, or perceive them as Rwandan implants rather than native Congolese.

The government in Kinshasa has repeatedly argued against tribalism and stressed that the Rwandan government alone is to blame for the M23 crisis. 

But the reality in the east of the country, about a thousand miles (1,600 kilometres) from the capital, is often different. 

AFP interviewed six Congolese Tutsis who had recently arrived in Goma, mostly from Kitschanga in North Kivu's Masisi territory. 

Five said they had fled death threats from militias.

"It hurts me," said the 55-year-old Tutsi woman, who explained that all her relatives were Congolese but her children were accused of being Rwandans at school. 

The sense of injustice is widely shared. A 36-year-old Tutsi mother of two, who'd also recently fled to Goma, told AFP she wanted the same rights as everyone else. 

She fiddled nervously with her wedding ring as she described why she left Kitschanga. "Militiamen notice your nose and threaten to cut it off with a knife," she said. 

Tutsis are often stereotyped as having straight noses.

The woman -- speaking in the Kinyarwanda language native to Rwandans as well as many Congolese Tutsis and Hutus -- said militiamen also looted her home after she fled. 

"They say every Tutsi is an M23," she said. "It's terrible."

The M23 first leapt to international prominence in 2012 when it captured Goma, before being driven out and going to ground. 

But the rebels took up arms again late last year, claiming the DRC had failed to honour a pledge to integrate them into the army. 

They've since seized swaths of territory and come within about 20 miles (12 kilometres) of Goma, a key hub of over a million people.