Halevi was recently recommended to lead the Israel Defense Forces
Hezbollah remains a threat in northern Israel, opposes any concessions to the Jewish state
But won't launch a criminal investigation since bullet was not fired deliberately, army says in a statement
The report by a London-based news outlet has not been verified by other media
The Israeli military only recently made use of armed drones public knowledge
The lethal Jabalia cemetery strike appears to have been confused with the fatal blast of a Palestinian Islamic Jihad rocket misfired a day earlier