MANCHESTER, N.H. —

The holiday season is underway, and many shoppers are turning to online stores for convenience.

However, online shopping doesn't always go as smoothly as expected.

"It can be easier, but sometimes you end up sending a lot back," said one consumer.

Shoppers need to be careful when buying from third-party sellers on sites like Amazon, Walmart and Temu.

Consumer Reports investigations have found that some products sold by third-party sellers can be fake, dangerous, or fail to meet U.S. safety standards.

"If you buy a product at a brick-and-mortar store and it causes harm, the retailer can be held responsible. But when you buy from a third-party seller on an online marketplace, that liability isn't always the same. Some third-party sellers may be unreachable or unaccou

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