Nafi' (may Allah have mercy on him) says that Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) was coming from Makkah, and when he reached the place called Qudayd, some news reached him from Madinah, so he turned back and entered Makkah without ihram.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9844