The FTSE 100 has experienced a decline, with reports varying on the extent of the drop, ranging from a slight slip to a decline of around 0.62%. The cause of the decline is also unclear, with possible factors including a cautious UK survey, an Asian tech selloff, mining stocks, and global tech weakness. Some reports also mention external factors such as Middle East tensions and oil price fluctuations, while others indicate a possible recovery with the FTSE 100 closing higher.