Separate charges have been laid against two Metro Vancouver men who police say are HIV positive, but didn't relay that information when they had sex with women.

A 28-year-old North Vancouver man charged with aggravated assault for allegedly having unprotected sex without revealing that he is HIV-positive is now facing four additional charges.

After Adam Thomas Rollo could was initially arrested May 19. Police said they believed he may have exposed other sexual partners to the infection because he has known about his condition since 2003.

Since his arrest May 19, four additional women have come forward to police. Investigators hope to speak with any other potential witnesses or victims.

Rollo is under court imposed orders to disclose his HIV status to all sexual partners.

He is white, 5-7 tall, with a medium build, hazel eyes and brown hair. Potential witnesses and victims should contact RCMP at 604-990-7491.

Anyone concerned about their risk of exposure is advised to make an appointment with a doctor immediately.

Meanwhile, the New Westminster Police Service issued a plea to the public Wednesday to help find a man charged with three counts of sexual assault after allegedly having sex with three women without disclosing his HIV-positive status.

It is believed Bongani Nyoni, 38, may have travelled to Eastern Canada and police fear he may engage in intimate behaviour with women without telling them about his HIV status.

A Canada-wide warrant has been issued for his arrest.