Ata (may Allah have mercy on him) relates that Ibn Abbas (may Allah be pleased with them both) used to slaughter camels in Makkah, but Ibn Umar (may Allah be pleased with them both) did not slaughter in Makkah; rather, he used to slaughter in Mina.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10232