Jeremiah 41:3,4

Ishmael also slew all the Jews and the men of war That is, all that joined in opposing him, and in assisting Gedaliah: for several of the commanders, as well as the greater part of the people, were still left alive, as appears by the sequel of the story. And on the second day after, &c., no man knew it That is, no man who lived at any considerable distance from Mizpah, for Ishmael undoubtedly used every means in his power to keep this slaughter secret, lest the news of it should reach the ears of some of the Chaldean commanders, and so he should be prevented from making his escape.