WASHINGTON--Administration demands that Congress act quickly to combat unrestricted German warfare in the Atlantic were strongly implemented tonight by the torpedoing and sinking of two more American-owned freighters and disclosure that the U. S. Destroyer Kearny was on convoy duty last Friday when it was attacked off Iceland.

Secretary of State Cordell Hull told the Senate Foreign Relations Committee considering the House-approved bill to arm American merchantmen that Germany is pursuing a policy of "intimidation and frightfulness." He urged arming of the cargo boats as a defense move before "it is too late."

Admiral Harold R. Stark, Chief of Naval Operations, followed Hull with a report on the Kearny attack.

VICITY--Fifty French hostages were executed by the Nazis in Nantes today in reprisal for the assassination of the district's military commander and the German commander of Paris announced tonight that another 50 would be executed if the assassins pre not caught by Thursday night.

The slain officer was Lt. Col. Friederich Karl Holtz, the highest ranking Nazi officer, yet to be shot since the occupation of 1940. He was cut down by pistol shots, reportedly fired by two youths, as he left his Nantes home yesterday on route to his office.

The executions brought to 131 the total Frenchmen killed in the occupied area since the start of a wave of terrorism in mid-August.