Video appears to show Massa to blame for accident with Perez in Montreal (Update)
UPDATE We found an overhead video that show they both moved – Massa right and Perez left. Perez did not move that much, but the combination of the two moving caused the accident.
06/09/14 As can be seen from this video starting at the 27 second mark, it is clear that Felipe Massa misjudged and ran right into the left rear of Sergio Perez on the last lap of the Canadian GP. You can see Perez is holding his line on the outside and Massa just drove straight into him.