Iraqi authorities arrested four men on Tuesday in connection with a shooting spree a day ago that left 27 policemen dead, including two officers killed execution-style.
 
The group was arrested in Salaheddin province, north of Baghdad, after a police raid, the interior ministry said in a statement on its website. A fifth man blew himself up when the police arrived, it added.
  
"The police of Salaheddin, after receiving reliable intelligence about the location of the criminal gang who carried out the assassinations against the police officers in Anbar, raided the location and arrested four of them," the statement said. "One of the terrorists blew himself up when they were surrounded," it added.
  
On Monday morning, suspected Al-Qaeda gunmen, some wearing army uniforms, raged through the western Iraqi city of Haditha, in Anbar province, in a pre-dawn shooting spree that killed 27 policemen.