trucks were loaded with construction and demolition waste, logs and other cargo. large concrete blocks, walls, wire obstacles and other materials were also used. the building work began on the evening of 13 january and took about three hours. the main objects of strategic interest were the supreme council buildings (old town near st. james's cathedral), the council of ministers (city center near the nativity of christ cathedral), latvian television (on zaķusala), latvian radio (old town near riga cathedral), the international telephone exchange offices (city center), ulbroka radio and bridges. barricades were also built in other parts of the country, including in liepāja and kuldīga.