Dubai has announced a three-day mourning period after the 33-year-old son of the Gulf emirate's ruler passed away, the UAE's official state news agency WAM said on Saturday.

Sheikh Rashid, son of the Prime Minister and Vice President of the United Arab Emirates Sheikh Mohammed bin Rashid al-Maktoum, suffered a heart attack on Saturday morning, the agency said.

Mourners gathered for the funeral at the Za'beel Mosque in Dubai.

Sheikh Rashid was the eldest son of Sheikh Mohammed. Rashid's brother Sheikh Hamdan is the Crown Prince of Dubai.

Source: Reuters