A day after Tel Aviv's Yasam officers cheered Yair Hanuna as he arrived for questioning in probe, Kobi Shabtai says police must be 'apolitical' and not protest state bodies

Moshe Karadi says force under minister's command could collide with cops, face contradicting orders

In letter to PM, ex-commanders say independent investigation needed to prevent future calamities; one says festivities should be halted for 4-5 years until proper safety in place