NEW YORK — Three more companies said Friday they had ended discount programs with the National Rifle Association, as U.S. corporations take a closer look at investments, co-branding deals and other ties to the gun industry after the latest school massacre.

Petitions are circulating online targeting companies that offer discounts to NRA members on its website. #BoycottNRA has trended on Twitter.

Members of the NRA have access to special offers from partner companies on its website, ranging from life insurance to wine clubs. For a second consecutive day, companies listed on the site have cut ties to the group as it aggressively resists calls for stricter gun control in the wake of the mass shooting last week at a Florida high school that left 17 dead.

The insurance company MetLife Inc. discontinued its discount program with the NRA on Friday. The car rental company Hertz and Symantec Corp., the software company that makes Norton Antivirus technology, did the same.

Insurer Chubb Ltd. said Friday it is ending participation in the NRA's gun-owner insurance program, but it provided notice three months ago. The program that provided coverage for people involved in gun-related incidents or accidents had been under scrutiny by regulators over marketing issues.

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Those defections arrived a day after car rental company Enterprise Holdings, which also owns Alamo and National, said it was cutting off discounts for NRA members. First National Bank of Omaha, one of the nation's largest privately held banks, announced that it would not renew a co-branded Visa credit-card with the NRA.

Other companies, including Wyndham Hotels and Best Western hotels, have let social media users know they are no longer affiliated with the NRA, though they did not make clear when the partnerships ended.

This is not the first time big business has been pulled into the gun debate. In 2014, Chipotle asked customers not to bring firearms into its stores after gun rights advocates brought military-style rifles into one of its Texas restaurants. A year earlier, Starbucks Corp. made a similar statement after the Newtown, Connecticut, shooting.