Egypt is building a mysterious 16-foot-high wall near the border with Gaza and it won't say why

• Egypt has begun construction of a wall near its border with Gaza, according to reports.
• Its purpose remains unclear, leading to speculation it could be used to hold those crossing the border.
• This comes amid increased border security in anticipation of Israeli attacks.

Egypt is building a wall near Gaza's border, but the government has refused to say what it will be used for, CNN and The New York Times reported.