By Andrew Mills and Eman Abouhassira DUBAI, June 29 (Reuters) - Iranian and U.S. technical teams working on the implementation of an interim peace deal are expected to meet in Doha in the coming days, a source told Reuters on Monday, after tit-for-tat weekend strikes threatened to derail the fragile accord. Mediators have established communications channels to de-escalate any incidents, and technical talks are set to continue, the source, with knowledge of the discussions, added.