A young woman whose naked body was found in a children’s playground in Ano Patissia, near central Athens, early yesterday morning had been struck on the head with a large stone or brick, according to police. The woman, who is believed to have been aged between 20 and 25, appeared to have been undressed by her attacker or attackers though police did not determine whether she had been raped. Officers found the woman’s clothes, bag and cell phone scattered around her. A coroner said that she died at around 3 a.m. At around the same time in the district of Aghios Panteleimonas, also near the city center, four Afghan immigrants are alleged to have mugged two Bangladeshi brothers at knifepoint, fatally injuring one of them. The victim had refused to hand over his wallet, prompting one of the assailants to knife him in the stomach, according to the surviving sibling. Police had not traced the attackers by late yesterday.