Egypt's military clamped down on the lawless Sinai Peninsula, which abuts Gaza, in the run-up to mass protests planned for Sunday by Egyptian opposition activists trying to force out the country's president, Mohammed Morsi.
It's not clear if the Sinai lock down is temporary or signals a tougher security regime aimed at restricting smuggling through tunnels running under the Egypt-Gaza border in the long term.
That would have a devastating effect on Gaza, which has relied on smugglers since Israel imposed a border blockade following the rise to power of the Islamic militant group Hamas in 2006.
"Nothing can get to the (tunnel) area," said Abu Khaled, 44, a tunnel operator in Gaza. "We are like a dry lake now. ... We all pray that this will end soon."
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Gaza has only small reserves of cement, steel and other materials for private construction. With few exceptions, Israel bans such goods for fear Hamas will divert them for military use.
For now, Gaza's Hamas government is keeping silent. Hamas and Morsi's Freedom and Justice Party share the same roots in the region-wide Muslim Brotherhood, and Hamas leaders appear reluctant to add to Morsi's troubles by complaining publicly about the disruption of smuggling.
The Egyptian military is known to be wary of Morsi's close ties to Hamas, viewing it as a threat to Egypt's public security. The military is bound to play a pivotal role in the current showdown between Morsi and his opponents, with both camps trying to ensure its support. Hamas would undermine Morsi by demanding an end to the Sinai crackdown now.