In a letter sent on Wednesday to Amazon, Walmart, Facebook and eBay, a bipartisan group of US attorneys general outlined specific steps it wants the online platforms to take to end this practice.

Pennsylvania’s Josh Shapiro is leading the effort along with attorneys general from the states of Connecticut, Vermont and New Mexico.

The steps include triggering price-gouging protections prior to emergency declarations in a state, being proactive in setting policies and restrictions on sellers instead of playing catch up and creating a “fair pricing” page where consumers can report incidents.

“They should use their data and analytics tools to stop price spikes, not play whack-a-mole when they find something on their platform…We are seeing them handle this on a case-by-case basis, which is really not practical,” Shapiro told Reuters in an interview.

The companies did not immediately respond to requests for comment.

Shapiro said his office has received approximately 2,900 tips of price gouging on online platforms and brick-and-mortar stores in the past eight to nine days and issued 90 cease-and-desist orders to sellers engaged in the activity. He said if these orders fail to deter merchants, his office can fine them up to $10,000 per violation.

The issue of price-gouging on online platforms has become a hot topic among law enforcement agencies, officials and lawmakers as panicked consumers look to stock up on essential items during the outbreak.

It also reflects the intense pressure online platforms are under to protect consumers while delivering goods during a pandemic.

Earlier this week, Amazon said it had removed 3,900 seller accounts involved in this activity. In early March, the company said it is working with state attorneys general to identify and prosecute third-party sellers.

A report by the US Public Interest Research Group released March 11, found nearly 1 in 6 of the products sold directly by Amazon had its price spike 50 percent higher than the 90-day average.

“Even new protections by your company including heightened monitoring, bans on certain advertisements, and bans on selling certain items, have failed to remove unconscionably priced critical supplies,” the letter said.