Two nurses have been attacked and robbed inside their Pretoria apartment by four armed men, according to police.

Johannesburg - A nurse was attacked with a hot iron when she and her colleague were robbed in their Daspoort, Pretoria, flat on Wednesday, police said.

The 24-year-old walked in on four men armed with knives who had overpowered her flatmate earlier when she opened the door after they knocked, Captain Bonginkosi Amos Msimango said in a statement.

After they forced their way into the flat at around 5.30pm, they tied up the first nurse, also aged 24.

When her colleague came home from work at the Hercules Clinic later, they tied her up as well and used a hot iron to burn her on her chin and elbow, until she handed over her car keys.

The men fled with a laptop and the woman's Polo Vivo.

No arrests had been made. - Sapa