Why were the other ships on iceberg alert?

The other ships were on iceberg alert due to warnings received about icebergs in the North Atlantic, particularly in the vicinity of the Titanic's route. Reports from nearby vessels indicated the presence of large icebergs, prompting a heightened state of vigilance. Additionally, the sinking of the Titanic underscored the dangers of navigating in those waters, making it imperative for other ships to exercise caution and adjust their speed or course accordingly.