i'm kasia madera with bbc world news. our top story: prosecutors in spain are preparing to file criminal charges against catalonia's deposed president, caries puigdemont. hundreds of thousands of people marched in barcelona on sunday for spanish unity, and against catalan separatism. hundreds of philippine families have returned to the southern city of marawi after five months of fighting. tens of thousands of people fled when islamist militants linked to the islamic state group tried to take the city in may. and this story is trending on bbc.com. lewis hamilton secures his fourth world championship at the mexican grand prix, making him the most successful british formula 1 driver in history. he joins sebastian vettel and alain prost on four world titles, behind only michael schumacher. that's all from me now. stay with bbc world news. now on bbc news, it's time for hardtalk.