John Gill Commentary Ezekiel 11:6

"Ye have multiplied your slain in this city, and ye have filled the streets thereof with the slain." — Ezekiel 11:6 (ASV)

You have multiplied your slain in this city. They had killed many of the prophets of the Lord that had been sent to them, and had shed much innocent blood. And not only had they unjustly condemned many to die and had put them to death without a cause, but also the death of all those that were slain while the city was being besieged and when it was taken were owing to their advice and counsel in encouraging them to hold out and not deliver up the city, fancying they should be able to defend it, contrary to the declarations of the Lord by the prophet. Therefore their death is laid to such advisers, and they are called their slain.

and you have filled the streets of it with the slain. Such numbers of innocent persons being put to death, as in the times of Manasseh (2 Kings 21:16), or so many dying of the famine, pestilence, and sword during the siege and at the taking of Jerusalem.