The entire police force in the coastal Mexican resort of Acapulco is under investigation amid suspicions of infiltration by drug gangs.
Two commanders accused of murder are being sought while the rest of the city’s police have been disarmed.
State police and the military will patrol the city instead.
Acapulco became famous as a destination for the rich and famous but it has fallen prey to the drugs trade and has a rampant murder rate. Last year, it stood at 103 per 100,000 inhabitants, one of the highest in Mexico.
The state where the city is located, Guerrero, is one of the most violent in the country with criminal gangs controlling areas where poppies are grown to create heroin.
Federal investigators said they had taken the step “because of suspicion that the force had probably been infiltrated by criminal groups” and the “complete inaction” in fighting crime.
With low pay and little training, local police in Mexico can be an easy target for drug cartels. There have been reports that the gangs offer them money to obey their leaders, and threaten to kill them if they do not.
Local police in other parts of Mexico have been disbanded amid concerns they were in the pay of drug cartels.
A Chinese man has been arrested for allegedly spying on US engineers and scientists on behalf of Beijing, US prosecutors say.
Ji Chaoqun, 27, was arrested in Chicago and charged with acting as an illegal foreign agent in the US, according to the US attorney’s office.
Mr Ji came to the US in 2013 to study electrical engineering and enlisted in the US Army Reserves in 2016. He allegedly sought to provide details on eight people for recruitment.
Mr Ji is accused of working for an unnamed high-ranking intelligence officer, according to a criminal complaint filed in a Chicago court. Prosecutors say he targeted other Chinese nationals who were working as engineers and scientists, some of whom were US defence contractors, for potential recruitment.
He arrived from Beijing in August 2013 on a student visa and studied at the Illinois Institute of Technology in Chicago. He later earned a Master’s Degree in electrical engineering in 2015.
A man arrested at Buckingham Palace on suspicion of possessing a Taser has been released by police.
The 38-year-old, a visitor to London from the Netherlands, was detained at the visitors’ entrance to the palace at about 12:45 BST on Sunday.
Scotland Yard said his possession of the device, which was low-powered and part of a keyring, was a genuine error, and that he posed no threat. The man was released without further action.
A spokesman said: “Officers are reminding visitors to the United Kingdom to ensure that any items that they are carrying comply with legislation in the UK. “This includes small knives and personal Taser-type devices, both of which may be considered offensive weapons or in breach of strict UK firearms laws.”
Parts of Buckingham Palace, which is the monarch’s official residence, are open to the public for 10 weeks each summer.
The Queen is currently at Balmoral Castle in Scotland on her summer break.