The Czech government has said it plans to tighten licensing laws for casinos following an explosion in Prague that injured 18 people.
The casino owner may have been the intended target of the attack
The finance ministry said it would carry out stricter checks on casinos, Czech TV reported.
Several foreign tourists were among those injured in Sunday's grenade attack, which happened on one of the capital's busiest streets.
Police are treating the attack as the work of a criminal gang.
They believe the Israeli owner of the Casino Royal, Assaf Abutbul, was the intended target.
Two years ago, Mr Abutbul's father, Felix, was shot dead by an unknown attacker outside the casino.
The BBC's Rob Cameron in Prague says there is a lucrative trade in flying gamblers to eastern Europe from Israel, where gambling is illegal.
Under Czech law, only Czech companies may be given a licence to run a casino. Mr Abutbul holds the Casino Royal through two Czech middlemen.