A southern Tunisian coastal town was paralysed by protests amid growing anger over the fate of people who drowned in a migrant shipwreck last month, with some buried in unmarked graves. The powerful UGTT labour union called a general strike in Zarzis on Tuesday, bringing to head days of smaller protests to demand authorities do more to find missing bodies and improve living conditions. Images showed the streets of Zarzis packed with protesters chanting anti-authority slogans with shops and government institutions closed. "Today the state continues to ignore us and does not even search for those drowned," said Salim Zreidat,…