Kigali became the capital upon Rwandan independence in 1962. Two other cities were considered: Nyanza, as the traditional seat of the ''mwami'', and the southern city of Butare (known as Astrida under the Belgians), due to its prominence as a centre of intellect and religion. The authorities eventually chose Kigali because of its more central location. The city grew steadily during the following decades; in the early 1970s the population was 25,000 with only five paved roads, and by 1991 it was around 250,000. On 5 July 1973 there was a bloodless military coup, in which minister of defence Juvénal Habyarimana overthrew ruling president Grégoire Kayibanda. Military officers had gathered in Kigali for a military tattoo to commemorate Independence Day a few days earlier, and they began occupying government buildings from dawn on 4 July. Businesses closed for a few days, and troops patrolled across the city, but the coup was bloodless and life continued as normal, historian Gérard Prunier describing the reaction as "widespread popular relief". According to a US Department of State diplomatic cable sent shortly afterwards, the disruption following the coup was short-lived and the army had left the streets by 11 July.