A Baltimore judge has acquitted a police officer of assault and other charges tied to the Freddie Gray Case.

Edward Nero’s acquittal on Monday dealt a significant blow to prosecutors who are trying to hold police accountable for Mr Gray’s death last year.

The 30-year-old officer was the second cop to face trial in the closely-watched case that triggered rioting and fuelled a national debate over allegations of police brutality.

Officer William Porter’s manslaughter trial was declared a mistrial in December after jurors were unable to reach a verdict following three days of deliberation.

Baltimore Mayor Stephanie Rawlings-Blake called for calm after Monday’s verdict.

In a statement, she urged residents to be patient and allow “the entire process to come to a conclusion”.

She said: “This is our American system of justice and police officers must be afforded the same justice system as every other citizen.”

Nero was one of three bicycle cops involved in Mr Gray’s initial arrest in April 2015.

He was not charged over Mr Gray’s death from a spinal injury suffered after he was arrested for fleeing police.

The officer elected to forgo a jury trial earlier this month, putting his fate in the hands of Circuit Judge Barry Williams.

He had faced a maximum penalty of 10 years in prison for the assault charge and up to five years on a reckless endangerment charge.

Judge Williams also cleared the officer on a charge of misconduct in office.

Ms Rawlings-Blake said Nero would face a police department administrative review.

Four more Baltimore officers are awaiting trial on charges ranging from misconduct to second-degree murder.