DEWSBURY police station was evacuated after a suspicious package was handed in at the front counter.
The building was cleared yesterday evening as a precaution while the bomb squad carried out checks.
Today the package was confirmed as containing a firework.
Police had also cordoned off Rock House Park in Batley Carr where the package was originally found by a member of the public.
A police spokeswoman said the park and station were closed off as a precaution.