P115 CEEFAX 115 Thu 23 Jun 20:04/20         SPAIN A policeman has been killed and three others injured in a car bomb attack in San Sebastian, north Spain. It is the second killing of a member of the security forces in two days. ITALY Police in Naples have arrested about 200 people including local politicians in a renewed sweep against the local Mafia. Magistrates has issued some 400 arrests warrants before the operation began. USSR Three unofficial Soviet peace campaigners were detained in Moscow after arriving at the British Embassy with a letter for Mrs Thatcher.