WASHINGTON — Egyptian military operations against militant Islamist groups in the Sinai Peninsula have not been affected by the Obama administration’s decision to withhold shipments of attack helicopters, tanks and missiles to the Cairo government, administration officials told Congress on Tuesday.

In an occasionally volatile hearing on Capitol Hill, representatives from both parties slammed the White House’s response to the June 30 military overthrow of the democratically elected government of President Mohammed Morsi.

Hundreds of Egyptians were killed during protests after the military takeover, prompting the Obama administration to put a lock on further shipments of military equipment in early October.