The FTSE 100 ended a strong week lower on Friday after once again setting a new all-time best, as investors locked in recent gains eyeing rising bond yields. The FTSE 100 index closed down 29.22 points, 0.3%, at 10,868.05. The FTSE 250 ended down 104.12 points, 0.4%, at 23,975.02, while the AIM All-Share closed down 2.35 points, 0.3%, at 762.55. For the week, the FTSE 100 was up 1.2%, the FTSE 250 was 0.7% and the AIM All-Share was down 1.2%. But IG Group plummeted 14%, the worst FTSE 100 performer, as investors weighed its 1.3 billion dollar acquisition of US fantasy sports and prediction markets operator Underdog.