Adha, a period of "communal enjoyment" for Muslims worldwide, has officially arrived. Here's what we've learned about the Islamic holiday.

Thousands of Muslims in Northern Ireland have gathered in south Belfast to celebrate Eid al-Adha. Organisers said about 4,000 people were expected to attend the event at a sports centre on Friday. Eid al-Adha, one of the main festivals in the Islamic calendar alongside Eid al-Fitr, will be marked in the UK between Friday and Monday.

Less spending, higher prices and fewer animal sacrifices subdued the usual festive mood as the Muslim holiday of Eid al-Adha was celebrated in many parts of the world.