AnalysisWire sometimes illuminates how full and complete information of events can take time (see here, for example).  The latest tragedy, the collapse of a Dhaka factory, shows how slowly the true scale of tragedy can emerge for the public to see:

Sources:  BreakingNews.com; Reuters

Methodology: 

• All fatality numbers are from BreakingNews.com, except the final number, which is from Reuters
• All Times are Eastern

Sources and times:

Date and Time                   Fatalities     Source (as reported here)

• 4/24/13 12:31 AM               3           ABCNews, AP
• 4/24/13 3:40 AM               32           AP
• 4/24/13 4:15 AM               70           BBC News
• 4/24/13 7:38 AM               87           AP
• 4/24/13 8:20 AM               96           Reuters
• 4/24/13 5:03 PM               123         CNN
• 4/24/13 9:18 PM               145         AP
• 4/25/13 12:49 AM             160         Reuters
• 4/25/13 2:21 AM               161         ITV News
• 4/25/13 5:45 AM               187         Reuters
• 4/25/13 10:37 PM             272         AFP
• 4/26/13 6:42 AM               300         AFP
• 4/27/13 5:06 PM               352         Reuters (not from BreakingNews.com)