IKEA is cracking down on people playing hide-and-seek in its stores. A growing movement in Europe has adults organizing hide-and-seek events in several IKEA stores, but the furniture retailer isn't having it. An IKEA spokeswoman said the practice is unsafe and could be a security risk. Thousands of people had signed up to attend a multiple store event organized on Facebook. The idea for the event came from a Belgian blogger who organized an event with the blessing of IKEA, but subsequent events have gone on without approval.