Tunisian presidential candidate Ayachi Zammel was placed in custody shortly after being released from pretrial detention on suspicion of forging ballot signatures, his lawyer said on Friday. Zammel, 43, is one of only two candidates approved by the electoral authority, ISIE, to challenge President Kais Saied in the October 6 poll. A court in Manouba, west of Tunis, ordered his temporary release late Thursday after he spent four days in detention, his lawyer Abdessatar Messaoudi told AFP. But shortly afterwards, Zammel was arrested again and placed in custody in Jendouba, about 150 kilometres (…