CAPE TOWN, South Africa, Aug 23, SPA -- South African policearrested Mark Thatcher, the son of former British PrimeMinister Margaret Thatcher, early Wednesday on allegationshe was involved in a plot to overthrow the government ofEquatorial Guinea, police said. Police spokesman Sipho Ngwema said Thatcher, 51, wasarrested at his Cape Town home and could be charged withviolation of the Foreign Military Assistance Act. He was expected to appear in the Wynberg Magistrate'sCourt later in the day to be formally charged, Ngwema said. "We have evidence, credible evidence, and informationthat he was involved in the attempted coup," said Ngwema."We refuse that South Africa be a springboard for coups inAfrica and elsewhere."--SPA1429 Local Time 1129 GMT www.spa.gov.sa/194993