PRO-INDEPENDENCE rebels tried to seize strategic buildings in the Congolese mining hub of Lubumbashi overnight, beheading two policemen and killing a soldier before security forces repelled the incursion, according to regional authorities. Democratic Republic of Congo's second-largest city is the capital of the mineral-rich southeastern province of Haut-Katanga, where mining companies such as Ivanhoe and MMG Ltd have concessions. Around 200 Mai-Mai militia, armed with guns and machetes, had marched into the city of around 2 million people with the aim of occupying official buildings and the local television station, provincial interior minister Fulbert Kunda said. Two police officers were…