This comes from the anti-Hamas Palestine Press Agency, so take it with a grain of salt, but the newspaper reports that Hamas is growing increasingly upset at the strings that are being attached to Iranian cash.
According to the article, Iran is pushing Hamas to execute "collaborators," something that Hamas is not keen on doing right now because it wants to cultivate a less violent reputation.
This week, Hamas plans to publish some of the alleged confessions from "collaborators" who turned themselves in.