Muslims around the world celebrated Eid al-Adha, the Festival of Sacrifice on Tuesday. The day commemorates the belief in Abraham's willingness to sacrifice his son Ishmael on God's command, and Ishmael's willingness to be scarified. Believers mark the holiday by slaughtering animals to feed the poor.
In Egypt, millions of Muslims attended services in local mosques, despite the prominent presence of security forces. Take a look at some of the stunning photos of the holy day below.
A butcher sharpens his knife after killing a ram as part of Eid al-Adha celebrations on Tuesday, Oct. 15, 2013. (AP Photo/Jon Gambrell)
Egyptians perform the Eid prayer at Mosque of Amr ibn al-As in Cairo the capital on October 15. (Elshamy/Anadolu Agency/Getty Images)
An Egyptian man carries his street stall in the Ataba market on the eve of Eid al-Adha, or Festival of the Sacrifice, one of the most important celebrations in the Muslim calendar, in Cairo, Egypt, Monday, Oct. 14, 2013. (AP Photo/Manu Brabo)
Egyptians perform the Eid prayer outside in Sidi Bishr city of Alexandria on October 15. (Ibrahim Ramadan/Anadolu Agency/Getty Images)
An Egyptian boy inflates a balloon on a street next to the Sayyida Zeinab Mosque on the first day of Eid al-Ahda in Cairo, Egypt, Tuesday, Oct. 15, 2013. (AP Photo/Manu Brabo)
Egyptian woman prays while holding her daughter on a street next to the Sayyida Zeinab mosque on the first day of Eid al-Ahda in Cairo, Egypt, Tuesday, Oct. 15, 2013. (AP Photo/Manu Brabo)
An Egyptian man pulls down a cow before sacrificing it it on the first day of Eid al-Adha in Cairo, Egypt, Tuesday, Oct. 15, 2013. (AP Photo/Manu Brabo)
A butcher stands in the blood of an animal sacrificed on the first day of Eid al-Adha in Cairo, Egypt, Tuesday, Oct. 15, 2013. (AP Photo/Manu Brabo)