First Minister Carwyn Jones has described a suspected terror attack at Westminster as "a terrible attack at the heart of our democracy."
Four people were killed and dozens more were injured after a car and knife attack in London on Wednesday afternoon.
AMs, Assembly staff and visitors have held a minute's silence in solidarity with MPs, who were also remembering those killed in the terrorist attack on Westminster.
It took place at 09:33, the same time as the minute's silence in the House of Commons. Meetings of Assembly committees were paused and the flags outside the Senedd lowered to half-mast.
A police presence remains at the rural Carmarthenshire home of terrorist Khalid Masood's mother on Friday evening.
Labour MP Chris Bryant described PC Palmer as 'our shield and defender yesterday.'
Rhondda MP Chris Bryant says security measures at the Palace of Westminster should be reviewed following yesterday's terror attack.