Paramilitary police personnel carriers appear to be parked in Shenzhen sports stadium

Satellite photos show what appear to be armoured personnel carriers and other vehicles belonging to the China’s paramilitary People’s Armed police parked in a sports stadium in the city of Shenzhen, which borders Hong Kong, which some have interpreted as Beijing threatening increased force against pro-democracy protesters.

The pictures collected on Monday by Maxar’s WorldView show more than 100 vehicles sitting on and around the soccer stadium at the Shenzhen Bay sports centre just across the harbour from the Asian financial hub that has been rocked by more than two months of near-daily street demonstrations.

Mass protests at Hong Kong's international airport descended into chaos as riot police used pepper spray and batons in an attempt to disperse the thousands of demonstrators who had grounded flights for a second consecutive day. 

• Hong Kong riot police clash with airport protesters

Beijing’s rhetoric escalating alongside video of troop carriers at border, yet experts say deployment a last resort

The messages from Beijing to protesters in Hong Kong are increasingly ominous. First there was propaganda footage of Chinese soldiers garrisoned in Hong Kong drilling for intense urban fighting that looked more like a civil war than search and rescue or crowd control.

Now footage has emerged of armoured paramilitary vehicles massing across the border. Two months into demonstrations sparked by a controversial extradition law, official rhetoric from Beijing has escalated too. Authorities recently denounced protests as “terrorist acts”, promised an “iron fist” response and, perhaps most alarmingly, described the movement as a “colour revolution”.

State media outlets videos with a rousing choral soundtrack show armoured troop carriers purportedly driving to Shenzhen, the south-eastern state that borders Hong Kong. Chinese officials have released a series of threatening statements about Hong Kong's protesters, with one claiming 'terrorism' was emerging in the city on Monday after flights were cancelled

• Hong Kong protesters return to airport as Lam warns of 'abyss'

Police fire teargas and beat demonstrators during fierce clashes across city

Hong Kong has once more descended into violence, with police firing teargas at protesters across the city as mass demonstrations calling for democracy entered their 10th consecutive week.

Clashes with police were particularly intense on Sunday night compared with previous days, as riot police fired teargas into a railway station to disperse crowds and were captured on film beating protesters with batons as they fled down an escalator in another station.