PRETORIA, South Africa — Gunmen stormed an illegal drinking venue in a township west of Pretoria on Saturday evening, killing 12 people — including a three-year-old boy — and wounding many others in one of a string of recent mass shootings that have shaken the country, police said. Police spokeswoman Athlenda Mathe said 25 people were shot in the attack at a shebeen in Saulsville township, about 18 kilometres west of Pretoria. Ten victims died at the scene and two more died after being taken to hospital; 14 people were…