LONDON, Wash. — Amazon has pledged to beef up the fight against fake reviews, Britain's competition regulator said Friday after an investigation into whether big online platforms are doing enough to crack down on phony online ratings for products and services.

The Competition and Markets Authority said it secured the “undertakings” from Amazon, after getting a similar agreement earlier this year from Google to clamp down on rogue reviews plaguing the internet.

The company promised to strengthen its existing systems for fighting fake reviews. It will also tackle catalog abuse, which involves sellers boosting star ratings for a product by hijacking good reviews from a completely different one.

As an example, a shopper might come across a pair of headphones with a five-star rating. But, a

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