again. They also played in the 2002–03 AFC Champions League but were knocked out at the group stage; Mahmoud scored 2 goals in that tournament, both against Turkmen club Nisa Aşgabat. While an Al-Talaba player, Mahmoud also represented the Iraq Police team in the 2002 Arab Police Championship, a competition for Police teams in the Arab world, along with the rest of the Iraq youth team players. Iraq Police won all 4 matches they played and they conceded only 1 goal in the tournament. They won the competition finishing 7 points ahead of the 2nd-placed team. It was the 5th time that Iraq won the Arab Police Championship in its history. Al-Wahda After the start of the Iraq War in 2003, football in Iraq was put on hold, so Mahmoud moved to Abu Dhabi club Al-Wahda in October. He scored in the 2004 AFC Champions League in a 3–0 win against Iraqi club Al-Quwa Al-Jawiya. A few months into his loan, he got into a verbal argument with the club's manager, Rinus Israël, who subsequently refused to play him in any matches from there on. Al-Khor After the 2004 AFC Asian Cup, Mahmoud joined Qatar Stars League club Al-Khor with his compatriots Haidar Jabar and Qusay Munir. In the 2004–05 Qatar Stars League, Al-Khor finished in 3rd place and Mahmoud scored 19 goals, the 3rd-highest amount in the league. He broke three records in one game in an 8–0 victory over Al-Shamal. Having scored 6 goals in the match, he became the only player to have scored two hat-tricks in a single league match. He also scored the fastest goal in a league match, taking 30 seconds to score after the game had started. Furthermore, he was the only player that season to score three goals in each half against two different goalkeepers. He assisted in the two other goals in the match. Al-Khor were knocked out of the 2005 Emir of Qatar Cup at the quarter-final stage, losing on penalties to Al-Sadd after a 2–2 draw in which Mahmoud scored. Al-Khor won the Qatar Crown Prince Cup though with Mahmoud scoring 4 goals in that competition including 2 goals in the final which Al-Khor won 2–1. Al-Khor finished in a disappointing 7th position in the 2005–06 Qatar Stars League, but Mahmoud scored an impressive 20 league goals, the 2nd-highest amount in the league. They were again knocked out at