A suspect package that contains & # 39; white powder & # 39; was sent to the judge who imprisoned Tommy Robinson.
The package was posted to Judge Geoffrey Marson QC at Leeds Crown Court.
It was here that he imprisoned the founder of Robinson, the English Defense League (EDL), for 13 months in May.
This is understood to have been sent to a public office in court before being identified as potentially dangerous.
Emergency services rushed to the court at 11.44 am after reports of "suspect mail items".
Police, fire department and ambulance incident response units attend the building at Oxford Row in Leeds city center.
The building was not evacuated and many of the courts continued to function as usual.
A spokesman for the West Yorkshire Police confirmed the item was now considered safe.
The spokesman confirmed that the incident was now treated as "evil communication".
Robinson – real name Stephen Yaxley-Lennon, imprisoned on May 25 by Judge Marson for allegedly insulting the court.
He was arrested, prosecuted and sentenced for filming people at the Leeds care trial and live-streaming recordings on social media.
The trial was the subject of a court order that prohibits reporting or broadcasting of a process to prevent prejudice related to trials.
Right-wing demonstrators have claimed that non-reporting trials are part of the establishment of covering up Asian pedophile rings.
The imprisonment of Robinson, 35, led to large-scale protests and threats directed at judges on social media.
Robinson was released from prison in August after the Court of Appeals overturned an insult to a court ruling while awaiting a new trial.
Details of the Leeds trial and two other related prosecutions were then published when the reporting of restrictions was lifted.