A gang of knife-wielding men jumped a delivery driver in Hong Kong and stole hundreds of toilet rolls, police said Monday, in a city wracked by shortages caused by coronavirus panic-buying.

Toilet rolls have become hot property in the densely packed business hub, despite government assurances that supplies remain unaffected by the virus outbreak.

Supermarkets have found themselves unable to restock quickly enough, leading to sometimes lengthy queues and shelves wiped clean within moments of opening.

There has also been a run on staples such as rice and pasta, as well as hand sanitiser and other cleaning items.  

Police said a truck driver was held up early Monday by three men outside a supermarket in Mong Kok, a working-class district with a history of "triad" organised crime gangs.

"A delivery man was threatened by three knife-wielding men who took toilet paper worth more than HK$1,000 ($130)," a police spokesman told AFP.

A police source told AFP the missing rolls were later recovered and two suspects were arrested on scene although it was not clear if they were directly involved in the armed robbery. 

Footage from Now TV showed police investigators standing around multiple crates of toilet roll outside a Wellcome supermarket. One of the crates was only half stacked.

Hong Kongers reacted with a mixture of bafflement and merriment to the heist.

One woman passing by the scene of the crime who was interviewed by local TV station iCable quipped: "I'd steal face masks, but not toilet roll."

The city, which has 58 confirmed coronavirus cases, is currently experiencing a genuine shortage of face masks. 

The hysteria that has swept through Hong Kong since the coronavirus outbreak exploded on mainland China is partly fuelled by the city's tragic recent history of confronting a deadly disease.

In 2003, some 299 Hong Kongers died of Severe Acute Respiratory Syndrome (SARS), an outbreak that began on the mainland but was initially covered up by Beijing -- action that left a lasting legacy of distrust towards the authorities on public health issues.

The new coronavirus outbreak also comes at a time when the city's pro-Beijing leadership has historic low approval ratings after refusing to bow to months of angry pro-democracy protests last year.

Authorities have blamed online rumours for the panic-buying and say supplies of food and household goods remain stable.

But the panic-buying has itself created shortages in one of the world's most densely populated cities where supermarkets and pharmacies have limited floor space.

Photos posted online have shown some people proudly stuffing their cramped city apartments with packets of hoarded toilet rolls. 

On Sunday, the head of the city's Consumer Council warned people not to stockpile toilet rolls in their flats as they were prone to mould in the notoriously humid climate.

She also reiterated that there were ample stocks of paper. 

Supermarket chain Wellcome called Monday's robbery a "senseless act", and called on people not to bulk buy or hoard toilet roll. 

"We want to emphasize that we have sufficient toilet roll supply to meet demand," it said in a statement. "The temporary shortage was caused by the sudden and unusual surge in demand."