WASHINGTON  Top executives at Blackwater Worldwide authorized secret payments of about $1 million to Iraqi officials that were intended to silence their criticism and buy their support after a September 2007 episode in which Blackwater security guards fatally shot 17 Iraqi civilians in Baghdad, according to former company officials.

Blackwater approved the cash payments in December 2007, the officials said, as protests over the deadly shootings in Nisour Square stoked long-simmering anger inside Iraq about reckless practices by the security company’s employees. American and Iraqi investigators had already concluded that the shootings were unjustified, top Iraqi officials were calling for Blackwater’s ouster from the country, and company officials feared that Blackwater might be refused an operating license it would need to retain its contracts with the State Department and private clients, worth hundreds of millions of dollars annually.

Four former executives said in interviews that Gary Jackson, who was then Blackwater’s president, had approved the bribes and that the money was sent from Amman, Jordan, where the company maintains an operations hub, to a top manager in Iraq. The executives, though, said they did not know whether the cash was delivered to Iraqi officials or the identities of the potential recipients.

Blackwater’s strategy of buying off the government officials, which would have been illegal under American law, created a deep rift inside the company, according to the former executives. They said that Cofer Black, who was then the company’s vice chairman and a former top C.I.A. and State Department official, learned of the plan from another Blackwater manager while he was in Baghdad discussing compensation for families of the shooting victims with United States Embassy officials.