When is it permissible if you're a Muslim to kill children?

Any old time, says Ayatollah Mohammad Taghi Mesbah -- just as long as the child is an Israeli child.

Ynet News:

Ayatollah Mohammad Taghi Mesbah, considered one of the Islamic Republic's most radical clerics, issued a religious edict on his website whereby suicide attacks are not only legitimate but are a must for every Muslim, a special paper by the Middle East Media Research Institute shows.

[...]

The follower presented another question regarding Islam's position on harming Israelis, wondering whether Hamas and Jihad actions against Israeli civilians are forbidden. He also asked: "How about the Israeli children killed in such attacks?"

The Iranian Ayatollah did not see fit to forbid the killing of children, only noting that Israelis can be harmed unless they openly express their objection to their government's position. He added that even in such cases, harming civilians is permissible if "they are used as human shield and fighting the aggressors depends on attacking those civilians."

Beyond these insights, the cleric did not offer further instructions and failed to censure the killing of children.

By the way, Ynet reports that this slimeball is the "spiritual mentor" of President Ahmadinejad. Tell me you're surprised.