Apple In and Inc ceased support for Parler, dealing a massive blow to a social-media service that has surged in popularity among conservatives and escalating a campaign by tech giants to control content they see as dangerous in the wake of the mob attack on the US Capitol.

Amazon said on Saturday that it would no longer provide cloud-computing services to Parler, and Apple suspended the company’s app from the App Store. Both companies said Parler hasn’t demonstrated in recent conversations that it can sufficiently address threats of violence on the platform.

The announcements from Amazon and Apple come a day after Alphabet Inc.’s Google suspended Parler from its Play Store app marketplace, citing violations of requirements for adequate moderation of content for apps it distributes. The move from Google didn’t affect Parler’s availability on the internet or in other Android app stores.

Engagement in Parler has increased since November as bigger social-network operators such as Facebook Inc. and Twitter Inc. have become more competitive in guarding content. On Friday, Twitter put a stop to President Trump’s personal account, fueling criticism from conservatives online who felt the endeavor was biased against them.