At least 49 dead in South Africa flooding, students washed away in bus
At least 49 dead in South Africa flooding, students washed away in bus

www.aljazeera.com
At least 49 dead in South Africa flooding, students washed away in bus

archived (Wayback Machine)
I'm giving that comma in the hed some serious side-eye. I get Al-Jazeera isn't an English-native publication, but they usually do better than this. In this context, the comma is saying the two are unrelated. An "as" or "with" fixes the issue.
Would a semi-colon work, to tie the two phrases together?
I’d probably replace it with the word “after”
I mean, that could work as well. A comma in a hed replaces "and" -- semicolons are very rare, though.