PRETORIA, South Africa - South African police photographs of the blood-spattered scene where Oscar Pistorius shot dead his girlfriend show that evidence was moved around in violation of procedure during the investigation of the killing, the athletes chief defence lawyer said Tuesday. In later testimony, a police ballistics expert police described how he tried to reconstruct the angle of the gunfire, citing tests that suggest the bullets were fired about 2.2 metres (7.2 feet) from a toilet door in Pistorius home. The bullets punctured the door, and three of them hit girlfriend Reeva Steenkamp, who was in the toilet cubicle. Warrant officer Bennie van Staden, a police photographer, took hundreds of photos of the scene, including of blood stains, bullet casings, a gun and a cricket bat found inside Pistorius bathroom in the hours after the double-amputee Olympic runner shot Steenkamp before dawn on Feb. 14 last year. Lawyer Barry Roux has challenged previous police witnesses, seeking to uncover contradictions and reported mishaps to support his argument that officers bungled the investigation, an allegation made by Pistorius at the start of the trial when he pleaded not guilty to murder in Steenkamps killing. In a painstaking process Tuesday, Roux minutely examined many photos taken by van Staden and another police officer and pointed out that objects at the crime scene had been moved and were in different positions in photos. Roux also used time of day records on the images to show that the two policemen taking photographs were in the same room at points, even though van Staden testified he was working alone. Pistorius, 27, is charged with premeditated murder for killing Steenkamp, 29. He denies murder and says he shot his girlfriend accidentally, thinking she was an intruder in a toilet cubicle in the bathroom, and says that he struck the toilet door with a cricket bat to get to Steenkamp after realizing what he had done. Prosecutors charge that Pistorius killed Steenkamp after an argument. Pistorius lawyer asked van Staden to explain differences in photographs of position of the 9 mm pistol that Pistorius used to shoot Steenkamp through a closed toilet door, and of a cricket bat that the Paralympian used to hit the door. "It seems there was movement of the bat" in the interval between two photographs taken by van Staden, Roux said. "It seems like that," van Staden conceded. The police photographer also acknowledged that two photographs of the gun indicated that a mat underneath it could have been shifted. Roux said one photo also differed from the other because it showed a wooden splinter on the gun handle. Capt. Christiaan Mangena, the police ballistics expert, said the bullets were fired at a slightly downward angle and entered the toilet door below the shoulder level of Pistorius, if he were standing without prosthetic limbs. Pistorius said he was on his stumps when he fired. Prosecutors do not dispute the assertion, after initially alleging he was on his prosthetic limbs when he killed Steenkamp. Mangena said he used thin rods and the beam from a laser mounted on a tripod to try to determine the trajectory of the bullets through the door. He also described entry and exit wounds on Steenkamps right arm and her head, and bruises on her chest where a "projectile" struck without penetrating. Associated Press writer Torchia reported from Johannesburg. Buy Nike Flyknit .B. -- Canadian pairs skaters Meagan Duhamel and Eric Radford went from elated to frustrated in the span of a few minutes. 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The first baseman hit a two-run homer in the top of the ninth inning to lead the Mets to a thrilling come-from-behind 3-2 victory over the Milwaukee Brewers.BOSTON -- Putting together a five-game winning streak and getting 10 games above .500 were once common achievements for the Dallas Mavericks. Now, both are season highs as Dallas slowly works its way back into playoff contention in the Western Conference. Dirk Nowitzki scored 20 points, Shawn Marion finished with 11 points and 10 rebounds, and the Mavericks beat the Boston Celtics 102-91 Sunday night to extend their winning streak to five straight. "There are encouraging signs, but theres no way we can exhale or start feeling good," coach Rick Carlisle said. Jose Calderon added 18 points and Monta Ellis played through a sore hamstring and scored 11 for Dallas, which won for the sixth time in seven games and pulled 10 games above .500 for the first time this season at 31-21. "Were looking to move up," Nowitzki said. "If you look at the standings, (places) five through eight is only separated by a couple of games. Wed love to keep pushing." Vince Carter scored 14, Devin Harris had 12 points and Samuel Dalembert grabbed 11 rebounds for Dallas. The Mavericks led by six at halftime and pulled away in the third quarter by outscoring the Celtics 28-18. "The third quarter and the start of the fourth killed us and took us out of the game," Boston coach Brad Stevens said. Rajon Rondo had 15 points, 12 assists and eight rebounds for Boston, which had won three straight games. Jeff Green scored 18 and Jared Sullinger had 11 points and 12 rebounds for the Celtics. Boston managed to stay close through the first half despite shooting 27 per cent, then Dallas took command early in the third quarter and pulled ahead by as many as 24 points before the Celtics rallied when it was too late. "We still kept it close. That was the beauty of it," Sullinger said. "We played hard, but they just got awway and the deficit was so big we couldnt dig ourselves out of that hole.dddddddddddd." The Mavericks opened the second half on a 16-5 run, holding the Celtics to two field goals through the first 6:29 of the third quarter. A 3-pointer by Green got Boston within 53-43, but Calderon answered from beyond the arc and Marion and Dalembert followed with layups to extend the Mavericks lead to 60-43. "In the third quarter, we were doing the same kind of defence, but now we were sharing the ball and making open shots and thats what the difference was," Calderon said. Bostons only scoring run in the period was a 4-0 spurt late on layups by Kris Humphries and Kelly Olynyk, which Dallas negated in the last minute on two foul shots by Harris and an alley-oop from Harris to Brandan Wright with 5 seconds remaining to give the Mavericks a 72-56 lead entering the fourth. 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