Former Mumbai Police Commissioner M N Singh on Tuesday expressed disappointment at the Home Ministry's "embarrassing" stand on the whereabouts of underworld don Dawood Ibrahim and said the response was a "big mistake" on part of the Government.

"Even our intelligence agencies have proved that Dawood Ibrahim is in the patronage of ISI.. hence saying that no idea where Dawood is... is absolutely a big mistake on behalf of the central government," Singh told PTI.