The four main suspects detained after the terrorist attack on a concert hall in Moscow were brought to the Russian capital for questioning on Saturday evening, according to Russian state news agency TASS, as the death toll reached 133. Unidentified perpetrators fired indiscriminately at concert-goers at the Crocus City Hall venue in the north-western outskirts of Moscow on Friday evening. Explosions were heard and a large blaze later led to the collapse of the building’s roof. The four men were arrested in the Bryansk region to the south-west of Moscow which borders Ukraine and Belarus and wer…