There's a longer account in Matthew 24:

(Matthew 24:4-22 NIV) Jesus answered: "Watch out that no one deceives you. {5} For many will come in my name, claiming, 'I am the Christ, ' and will deceive many. {6} You will hear of wars and rumors of wars, but see to it that you are not alarmed. Such things must happen, but the end is still to come. {7} Nation will rise against nation, and kingdom against kingdom. There will be famines and earthquakes in various places. {8} All these are the beginning of birth pains. {9} "Then you will be handed over to be persecuted and put to death, and you will be hated by all nations because of me. {10} At that time many will turn away from the faith and will betray and hate each other, {11} and many false prophets will appear and deceive many people. {12} Because of the increase of wickedness, the love of most will grow cold, {13} but he who stands firm to the end will be saved. {14} And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come. {15} "So when you see standing in the holy place 'the abomination that causes desolation,' spoken of through the prophet Daniel--let the reader understand-- {16} then let those who are in Judea flee to the mountains. {17} Let no one on the roof of his house go down to take anything out of the house. {18} Let no one in the field go back to get his cloak. {19} How dreadful it will be in those days for pregnant women and nursing mothers! {20} Pray that your flight will not take place in winter or on the Sabbath. {21} For then there will be great distress, unequaled from the beginning of the world until now--and never to be equaled again. {22} If those days had not been cut short, no one would survive, but for the sake of the elect those days will be shortened.