What is the meaning of "va'Hakitzosi la'Ari'el"?
Radak: Yerushalayim is called Ari'el due to the Mizbe'ach in it. Hashem will pain it; Melech Ashur seized everything around it.
Malbim: I will pain it mortally.
Why is the wailing doubled?
Radak: Yerushalayim will cry over their brothers killed in surrounding cities, and they are also afraid for themselves.
Malbim: It laments its sins, and its bad Mazal.
Why does it say "v'Haysah Li ka'Ari'el"?
Rashi: It will be surrounded with people killed via the sword (Radak - in the surrounding cities), like a Mizbe'ach surrounded with animal Korbanos. Radak - it says "Li", for just like Korbanos of the Mizbe'ach are offered for Me, so the blood of those killed is for Me. It was My desire - Melech Ashur is called "Shevet Api u'Mateh
