Hong Kong police are hunting for at least 13 men who robbed two male victims from mainland China of HK$2.3 million (US$294,600) in a guesthouse in Kowloon’s Mong Kok area early on Wednesday.

At 1am, the gang entered the 16th floor of Kingland Apartments on Nathan Road, and two of them knocked on the door of the victims’ room, Oriental Daily reported.

A Chinese man surnamed Chan, 31, and his 27-year-old friend, who were in the city on two-way entry permits, opened the door and were physically attacked. The two culprits grabbed a backpack with HK$2.3 million cash and an iPhone worth HK$8,000 and fled with the rest of the gang.

Chan immediately called the police. Officers searched around the area but found no one, HK01.com reported.

Staff in nearby shops said the gang had gathered on the ground floor of the building for an hour before the robbery took place.

Police are investigating surveillance-camera footage and hunting the gang. Ten of them were described as of South Asian appearance, along with three apparently local Hong Kong men, aged around 30 with short black hair.

It was understood that the two victims were in Hong Kong to procure electronic components.