Israeli air strikes shook Gaza every few minutes on Wednesday, and militants kept up rocket fire at Israel's heartland in intensifying warfare that Palestinian officials said has killed at least 53 people in the Hamas-dominated enclave. Missiles from Israel's Iron Dome defense system shot into the sky to intercept rockets launched, for the second straight day, at Tel Aviv, the country's commercial capital. Some were also aimed at Israel's Dimona nuclear plant, 80 km (50 miles) from Gaza, but were either shot down or landed in open country. With cries of "Allahu akbar" (God is Greatest), Palestinians in the Gaza Strip cheered as rockets streaked overhead toward Israel, in attacks that could provide a popularity boost for Islamist Hamas, whose rift with neighboring Egypt's military-backed government has deepened economic hardship. Dimona, desert site of a nuclear reactor and widely assumed to have a role in atomic weaponry, was targeted by locally made